Measuring Density of Small Irregular Objects

[@Nighthawkinlight]

It's this sort of application that makes you really appreciate the metric system.

[@Chickennuggetjoes]

Nah, that's too easy, you gotta use decimal points if you want to level up your math skills

[@easyhowtovids1082]

It's awesome you and cody are friends!

[@easyhowtovids1082]

I bet you two flap ;)

[@ezradelsman6743]

I agri

[@IamGrimalkin]

Because fluid ounces are too big a unit for this kind of work?

[@theCodyReeder]

Yay! It finally uploaded! And it only took 22 hours!

[@a474dm6]

Lol how come?

[@bobtomson9324]

Wow... That sounds like a fun wait.

[@itsjoel3355]

What editing software do you use? And what are your computer specs?

[@1mawesomel1kethat]

hi I sent you a message on another video (making nitric acid video) and I was wondering if you could answer my question

[@doctorbell60]

*Slow clap*

[@alcapone5791]

You have the handwriting of a true scientist, Cody

[@albertwilson1295]

Indeed.

[@franciscoaguilera49]

gotta keep the writing sloppy so no one can cheat off ya!

[@franciscoaguilera49]

***** Its even more concrete if you're left handed!

[@djmuldrow4376]

tru

[@Dalziel45]

He's being a Jack of being ambidextrous, but Master of neither hand.

[@theskv21]

7:24 "bye"

[@wayutakemura919]

hope he finds it again

[@notaveganvegan6655]

ikr lol

[@johnbarlow1892]

Felicia! :D

[@ManyGP]

7:23 is a bit better

[@journey8187]

Eamon Bohan q

[@AtomicShrimp]

Great video! I really like the exploration of different methods. This (by which I mean this specific video) should be in the school science curriculum

[@xhiimyourgod]

I will never be able to express my gratitude to you for everything you teach me. You've taught me so much about things I didn't know I had any interest in, in such a captivating way. Thank you!

[@Pwn9Crafter]

cody could make a video on watching grass grow interesting

[@clashofgamez2050]

ikr

[@azeliaspank]

#dicksout4harambe

[@SuperRandom6013]

Yes maybe a time laps

[@securefett]

grass is a useless plant and it should be hum watching his plants grow

[@bcubed72]

+Securefett Au contraire, it is great at preventing soil erosion. It also minimizes storm runoff (vs paving your yard, and/or putting in gravel.) Most of its bad rap comes from growing it in incompatible climates... here in rainy Pittsburgh, it grows effortlessly! (As a lawn guy, NONE of my customers irrigate their lawns, though a few have to run French drains to keep their yards solid in the springtime.)

[@ActionLabShorts]

I appreciate you mentioning that the scale is giving mass units, not weight units:)

[@pumbi69]

.

[@varanski]

hey

[@TheReformedSinner]

Wouldn't it be necessary to make sure the wire doesn't move up or down in order to have an accurate reading?

[@theCodyReeder]

yes, that is what the stick was for.

[@alexlawson4173]

I assume because it reads the amount of wire submerged in the liquid.

[@DamianReloaded]

+Cody'sLab if you inflate a balloon inside the water would you get the density of air?

[@alexlawson4173]

I don't think so. It would float up. The only way to keep it submerged would be to tie it down and it would just pull up. I'm not sure though.

[@DamianReloaded]

I'm a dumbo. You need to also know the weight (mass) along with the volume to calculate the density **facepalm** it's 2:30am

[@Roter_Wolf]

I watched this video years ago and today it paid off! As part of my bachelors thesis I need to know the accurate volume of chicken eggs. I remembered this video and it works wonderfully. Thanks, Cody!

[@sierra3159]

I love that when it rolls away there's a quick "Bye!"

[@brabham74]

Cody, you never fail to make me feel like I am not very smart, but I really do enjoy your videos anyway. I learn something every time I watch. Thanks.

[@aadityahingoo1506]

You should do a vid on extracting Mercury from a fish

[@nickallegro1741]

It's amazing how much your channel has grown, I came with the first wave of subscribers and it makes me so happy to see how many people have joined in!

[@FallencloverTV]

The mark of a scientist: Bad Handwriting.

[@cataractamoana7482]

yeeee

[@chrisisteas]

I think that is because he is sometimes filming with his writing hand. Or he might just be lefthanded.

[@RolandasVyniautas]

he wrote with his left hand, and his right hand afterwards

[@intothecalm420]

+chrisisteas That was a compliment not a cut down. Scientists, like myself, enjoy our writing style. We always can recognize our own work.

[@issachocolate5116]

good.. my hand writing has progressively got worse since preschool

[@ChevisPreston]

I've never actually thought of measuring density like this. Somehow, you're still producing quality material. Keep at it, Cody!

[@alphaadhito]

I hope Cody's not going to start running around his house naked yelling "Eureka!!" isn't?

[@GirishManjunathMusic]

Actually, as long as he isn't nude, that wouldn't be too bad.

[@sleeptyper]

His girlfriend might giggle a bit. :P

[@discordiangod]

I liked that reference sir!

[@Ludix147]

+

[@ficolas2]

Arquimedes didnt do that tho, its a mith

[@deeprajsarmah]

Thanks Cody. I learnt this from you and now I apply this method to measure the density of frozen phase change materials in the company I work. Great job making these videos.

[@turtleking5218]

SOMEONE GET THIS MAN A NOBEL PRIZE

[@aeroscience9834]

TurtleKING521 for what?

[@entreprenosh]

Just met a fellow Cody's Lab fan In Real Life over the weekend! He got pulled in to Cody's awesomeness by a precious metals episode just like I did. We also both binged the bee series. Keep up the good work +Cody'sLab , Love your videos.

[@sno_crash]

earlier this year i had to use the same method, but used a much higher density liquid for improved results. We made a Gallium Osmium alloy which had an SG 17 and was liquid at Australian room temperatures (35.3c)

[@theCodyReeder]

I'm very interested! I've never heard of using a gallium osmium alloy! I have to try this now.

[@FranzFartinand]

Sounds dense

[@sno_crash]

***** the easy way might be to dissolve (react) osmium into gallium slowly at around 50c - see how you go.

[@CowInspector]

which aussie university/facility was this at?

[@T3sl4]

Hmm, that doesn't sound right. I don't have a phase diagram for that, but I'd guess the Ga-Os system contains lots of intermetallics. Or that they're immiscible (which is the case for the only one I do have, Ag-Os). In either case, I doubt you'd get a nice low temperature amalgam of anywhere near that density. But I'd love to see the data, if it exists.

[@aldrifaen1831]

the bead rolling away and the little "bye" text was hilarious

[@catzarekool]

Bush did Harambe

[@Yahaw]

You're 9

[@stovinbaldwin7558]

( ͡° ͜ʖ ͡°)

[@MacroRoni]

stay woke

[@glockfan112]

#dicksoutforharambe #winkiesoutforpinky

[@jakesnake9021]

🌳=(✈️+🏢🏢)+(🐒+🚶🏽)

[@havoc1zero]

Oh Cody, Cody, Cody. You have a way of mesmerizing me while I watch these videos. I always thought I was a science nerd but you, my friend, are my new hero. Keep the videos coming.

[@prestonehlers]

I have a Question: when you weighed the crystal you put it in the beaker of water, wouldn't the .333 be the weight of the crystal plus the water displacement? so the weight would be around .238 (unless the height of the object is important). anyways , love your vids! and I live not far from you!

[@TheMCGamer2012]

Theoretically, if the crystal is supported from a suspended wire and not actually having it's gravity and mass directly in contact with the scale, it acts as a "crystal of water" when it merges in volume and then you figure out the funny business on why it's readings are different than a crystal-sized amount of water with some math! :) Hope that helped.

The mass of the crystal is hung from the ceiling, so it doesn't affect the measurement. What does is the fact that the volume of fluid it displaces will be pushed higher up in the beaker, meaning you have a higher column of water, and a higher column will exert more force.

[@DrMrSuperAwesomeGuy]

Right, but he measured the mass of the crystal INSIDE of the beaker. This means it was submerged and there was a buoyant force present. EDIT: I'm wrong

PterodactylDanceParty He didn't measure the mass of the crystal. The crystal was entirely supported by the rod. He measured the buoyant force alone.

[@DrMrSuperAwesomeGuy]

I'm not talking about that. Go to 3:02 in the video, he drops the crystal into the water and it falls to the bottom. He uses that number as the mass of the crystal, which is incorrect. I assume Cody realized this for the brass onwards, but left it in the video for the crystal. EDIT: I'm still wrong

[@unabashedindividualist6232]

Cody, I've been a fan for a long time and its great to see your channel blowing up as much as it has! I will say, as a commercial artist, your math and methodical videos really bake my noodle but I am addicted!

[@jaxonm530]

Hey cody are you working on uploading a new codys mine? I series is gr8

[@theCodyReeder]

yes

[@shimmos34minigamesandmore49]

+Cody'sLab yay!

[@akureyri2824]

Great :)

[@cullenpurkis4593]

Way to go Cody! You have just solved a problem I have been struggling with. This is very helpful and quite clever. I am proud to support you on patron and think everyone should. I hope to meet you one day and buy you lunch for all the great work. Take care and thanks again!

[@pielordminiman8124]

Are you trying to train yourself to be ambidextrous? Because your left hand (My off hand) writes a lot like mine does.

[@gmrads]

I'm ambidextrous to a extent. I prefer left handed but will use right if I want

[@timtoolman9883]

+Gmrads me too, sometimes I even use other people's hands.

[@danielchin4198]

i tried using my feet,yeah that didnt go well

[@timtoolman9883]

+Daniel Chin your name is Daniel chin? That's hilarious.

[@MsHojat]

I love this. It's so simple in a sense, but also smart. I don't recall being taught this despite post-secondary education that was right up that alley

[@name8212]

Hey Cody, can you make one of those meteorite hunting videos anytime soon?

[@The.Talent]

I've watched a bunch of related topic but never quite got the principal. This video clears it right up! Thanks Cody!

[@Slimshayden2]

Cody, when measuring the weight of an object, make sure you turn off the lights in the room. The added weight from the light will skew your results...

[@theCodyReeder]

out in the 11th or 12 decimal place... lol

[@supernoodles908]

Slimshayden2 not if you zero the scales when the lights are on :p ( presuming the light is of a set intensity and frequency spread )

[@daddydoc1115]

And talk very quietly so it doesn't change

[@daddydoc1115]

Also hold your breath

[@Dmayrion2]

Seriously. Thank you. You have helped me solve a problem of calculating volumes of the inside of pipe joins. I'm dealing with the ideal gas law as a research tech, and the V portion is annoying to get at such small volumes.

[@jeffrydemeyer5433]

When doing a video about this you are obliged to run naked trough the streets yelling EUREKA

[@dbcooper1492]

And post the vid on KZbin.

[@anne-droid7739]

@jeffry Exactly what I was thinking!

[@HarryRunes]

I was really expecting this video to be a boring how-to of just dividing mass by volume by measuring it with a scale and a graduated cylinder, but I should have known to expect more out of Cody! This is actually a really interesting video!

[@Jebula999]

I know the video is old, but surely by dropping the crystal into the beaker, you are getting its weight as well as its displacement. So shouldn't you take the 0.333g minus the 0.1g of boyent force to get the objects true weight?

[@HomemadeChemistry]

+Cody'sLab This kind of makes sence...

[@rileymike3534]

I think the answer would be no because Archimedes' Principle states that the buoyant force acts upward at the center of the mass. The object rests on the bottom and there is no water underneath it.

[@andrzejsamorzewski146]

Jebula999 No

[@wasfas1977]

I know it's been a long time but: no, whatever force the crystal is doing on the water (what you want to subtract) is experiencing itself in the opposite direction so technically it would exert that amount less to the beaker directly (so, indirectly the sum is the same). An easier way to see it is as simply a "closed" system but that doesn't really explain the problem you pose.

[@benjaminraymond7733]

great vid man, not long before you hit 1m, I remember your 10k special and ive been hooked ever since, watched every vid as soon as I could and I think what your channel has grown into is amazing, keep doin what youre doing because we love it

[@zappadow6538]

Cody ur left handed?

[@theCodyReeder]

I am equally bad with ether hand.

[@RobertSeviour1]

Stay off the ether then.

[@c1a9h9r9]

this is how the balance of jolly works, I used a couple times at the school ( very old equipment) you are great cody greetings from Mexico!

[@Topblackbird]

Does someone care to explain to me why the rock math yielded 2 significant figures? I thought because the volume (10.00) had 4 sf compared to the mass 5 sf the final answer would have 4 significant figures?

[@theCodyReeder]

That was me goofing up, interestingly this is the reason I got such low grades in my science classes.

[@TheBlackBeltPanda]

Grades are a terrible unit of measure. Just look at Michael Faraday. =P

[@mysteriousstalkerthathides1017]

+Cody'sLab are you left handed or was your right hand holding the camera

[@Topblackbird]

***** Phew! Thought I got something seriously wrong when preparing for AP Chemistry. Keep up the great videos! :D

[@chang.stanley]

Omg, you're such a genius. I've never thought of this technique but, it makes so much sense and now knowing it, so obvious.

[@dedriver713]

Does anyone notice his hands are always dirty

[@GuiltyParadise]

He does a lot of digging/mining

[@caseythimm5522]

I think you might be noticing the acid burns. I believe it's from nitric acid.

[@GirishManjunathMusic]

Also, nitric acid stains.

[@KingOSquids]

He's a working man!

[@azeliaspank]

Cause he does shit. I don't do shit. I have clean hands, at the cost of a life.

[@joshualiebman1991]

Was about to sleep but I saw papa Cody posted something, staying up to go binge this, the mine, and beekeeping again

[@eternalknives9829]

7:22 see ya later!

[@lolldamann6890]

that got me to

[@timtoolman9883]

Ok see ya give me a call when you get back so we can watch a movie or something.

[@jasonjoby4771]

yeah lol

[@lewismassie]

I loved that bit. Editing Cody has a great sense of humour

[@darren2650]

I had good laugh too xD

[@HuskyMachining]

dude, went though 5 years of CHem E and never learned this method (its so simple too, Im kicking myself for not thinking of it).... I actually needed to do something like this a few months ago.... Thank you, learn something new every day (because of youtube)

[@KingOSquids]

Wow I didn't know you were left handed

[@KingOSquids]

Or wait ambidextrous wow

[@dylanzrim1011]

by that handwriting I'd say he needs to swap hands

[@McVidsAndTutorials]

+Dylan Zrim his handwriting is still much better than mine. Sometimes I can't even understand what i've written sometimes.

[@McVidsAndTutorials]

oops. accidentally typed "sometimes" twice

[@dylanzrim1011]

+McVidsAndTutorials I understand Cody is forcing himself to be ambidextrous also. which is something I would like to do

[@twiggz1000]

idk man somthing about the combo of charm, interesting subject matter and just the way you do things make me really love your videos. keep up the good work Cody!

[@MartynDerg]

7:21 bye!

[@jodigibson8762]

I'm a chemist, and I love watching your little chemistry lessons. You're making chemistry fun which is awesome!

[@JustinKoenigSilica]

prove that you're a chemist?

[@jodigibson8762]

+Justin Koenig why would I have to prove that? Anyways, I have my BS in chemistry...

[@JustinKoenigSilica]

Jodi Gibson because i've some people comment on 10 different videos that they are 10 different "experts" on some subjects and have dropped their "expert" opinion on 10 different subject, 10 different times.

[@jodigibson8762]

+Justin Koenig no. I've actually studied the subject for many years. I currently tutor it and plan on teaching it.

[@jonathanvanhyning3344]

When it's and 8minute video and there are 38 comments after 3 minutes.

[@BloodSprite-tan]

that's because people make shitty comments like this.

[@Camelotsmoon]

+Moth and this

[@pluransart1795]

Make KZbin Great Again !

[@Aquana01]

+Vacso Kagazzle Laloobay Hoophorn Wacago Seiliu build a wall for dumb comments

[@MusicThatILike234454]

That is a ridiculously clever solution to the problem (in my opinion at least). Love what you do, looking forward to the next video!

[@gavigu4360]

Cody make a vacuum chamber

[@theCodyReeder]

I would like to see him do that too! Question? is the density of water defined in an atmosphere or a vacuum?

[@gavigu4360]

Atmosphere

[@gavigu4360]

Am I right

[@jackfromstatefarm9907]

+Cody'sLab *ques xfiles* In theory it should be the same... But if air escaped from the water, wouldn't it be slightly less dense? Like .0000000000000001 g/cm^3?

[@arufuredo]

You made me come and see this video, and I am actually really amazed! So interesting, I want to thank you for teaching me this. Cheers!

[@pumpitup9090]

Is he ambidextrous? Because, I swear i just saw him writing with his right hand in another video. EDIT: Yes he is.

[@acousticlee]

Exactly what I need for my plastics identification guide for work! Thanks!

[@yoan0197]

he uses Samsung Galaxy. Not surprised because he is smart ;)

[@HaruGyeoul]

Shotz fired

[@Levi-qu8yl]

If you define someone's intelligence by the phone they use, you're pretty stupid.

[@USWaterRockets]

I'm sure Cody would reject any phone made by a company that replaced their pistol emoji with a squirt gun. I mean, look at his channel!

[@svampebob007]

+possiblyamango 77 He didn't define Cody's intelligence by the phone he uses, but rather he noted that Cody is using a Galaxy because he's smart. Lots of intelligent people aren't the smartest cookies when it comes to picking phones or measuring systems, but smart people pick Samsung Galaxy and metric :) damn that could be an advert right there, you're welcome Samsung.

[@James-ic2zn]

+USWaterRockets 🔫🔫🔫🔫

[@Frederikbm]

I do not know how I found your channel Cody but I am very happy I did. Greetings from Denmark

[@JoeyBartlett]

This is great! I recently got possession of a blowtorch which I proceeded to use on a piece of mystery jewelry, and using an old spoon, I separated the odd gems (probably cubic zirconia) from the molten metal. Then I got a shiny little bead that after a few days darkened much like silver. (and the bangle had a thin layer of plastic over it too) I didn't have any lab equipment, so I made an improvised scale from some knex, compared the weight to a few pennies (5 grams), then measured the volume with a cough syrup syringe my parents used for my brothers when they were little. The density was higher than osmium! and the temperature I estimated by the color of the red hot spoon (by way of a blacksmithing chart), was about 1600-1700 degrees Fahrenheit. I then when to my high school soon after, and used a graduated cylinder along with a more accurate scale. I got 2 milliliters along with with 4.5-4.6 grams (my improvised scale worked better than I thought! So a density of 2.5 grams per milliliter (I'm not bothering to do the math, this is just from memory), it was about a fourth of the mass of silver as I thought the metal was. Definitely an alloy of some sort and melts rather nicely, just wish my blowtorch head wouldn't just blow out and freeze the metal with icy propane than a 2000+ degree flame. :P

[@isak_elof6987]

The little ball of platinum "bye!". Also: super happy that you use the metric system for this, it would be way to confusing if you were to use the emotional rollercoastersystem

[@Ramon314]

Awesome video Cody!! Now I know and understand how to get the volume of an object big using a scale!

[@gator2258]

Cody'sLab: making AP Chemistry make more sense while making it interesting as well

[@ghostindamachine]

Thank you for this great video. Learned something new, whilst zipping coffee on a lazy Sunday morning :)

[@usscole24]

you make people like me want to get smarter every day watching your videos makes me want to get smart

[@billydengel6647]

Your videos should be shown in all high school science classes.

[@NitroJonScience]

Super-useful, Cody. Thanks for helping me in a pinch!

[@cooperchall]

Hey Cody Can I just say, I love your channel so much, I think it's absolutely spectacular, the things you do and the problem solving skills you have are phenomenal. Keep it up

[@pahasapaman]

Thanks for another one Cody. Great science explained simply. Loved the bb traveling actoss the data figures.

[@RandyLunn]

Thank you Cody. I am going to use this method to determine the amount of gold in specimen gold nugget that has quartz as a companion host rock. This would make a great Part 2 for you.

[@saraweissel5336]

Honestly this is the most interesting video you've ever done. Maybe you would consider making some more in this vein?

[@glenwarren404]

im gonna watch this again. not that i use this formula much but i love this stuff. got lost around the middle of the video them picked up again near the end. well....anyhoot....back to the begining.

[@glenwarren404]

Ah...I see where im confused. Instead of taking into the account of the wire displacing some water. .. ya zeroed out the scale with the wire already in solution. The formula for a sphere has always been one of my most fun ones. I wish I had a use for mercury. I miss owning some.

[@SpecificLove7]

Wow your science skills are awesome

[@ShroomLab]

Haha did a vid on this topic three weeks ago too but the idea with the wire is great! It does ignore the meniscus and the surface tension.

[@dylanmckeithen4541]

Very clever. I'll definitely keep this method in mind. Thanks for the video!

[@craigslitzer4857]

That's really clever! You're using the "pressure fluid height" relationship to read tiny changes.

[@johns.1857]

My science students love your channel! More, more more!

[@jamesscout9290]

I love your videos man. Discovered you about a year ago. Been subbed and always eager for more

[@steelshade]

A real education. Thanks, Cody!

[@pinklightning8726]

Usually I get confused in the video but just the title got me on this one

[@Sam-ze9mo]

Hi Cody! your videos are awesome, and I learn so much new stuff from you. you're awesome!

[@PakAdiYak]

Pretty clever Cody :D Always fun watching your videos.

[@Stray03]

Not that it matters but why do you keep switching hands to write? Practicing your left?

[@Peter-s7m]

Cool. So with the values you came up with your gold piece...what's the approximate karat of the gold??

[@backyardsounds]

Yay! A new Cody's Lab! what's the density of awesome? Cody's lab! That's what!

[@El_Chompo]

When you get to that extreme side of scaling with the mercury and tiny bead of metal, a significant amount of the surface of the mercury was bent with surface tension. Is that capturing some of the energy and affecting the calculation at all?

[@henryjarnigan]

Cody, I have a problem. I'm working on a diving bell, but I don't know how much weight is needed to hold down a large bucket of air underwater. Is there a way to calculate this based the amount of air i want to pull down?

[@theCodyReeder]

take the bucket, turn it upside down, put it on a scale, take down the weight, fill it with water and the increase in weight is the minimum you need to add in-order to get it to sink.

[@dyllanusher1379]

this is one of my favorite videos, hopefully I'll be able to apply this in a lab

[@x9x9x9x9x9]

I love how late/early you upload. If I am procrastinating going to bed I now have an excuse.

[@theCodyReeder]

Film all day, upload all night, thats how I roll. ;)

[@NICOTHATKID]

I got a job interview tomorrow but if rather stay up watching your videos.

[@bottlecappoppie7812]

I am a metal detecting hobbyist. I often find small rings I try to identify as to composition. I can weigh rings for example on my jewelers scale, but the volumes are so small, it's difficult to measure at home. An example is a ring I have that passed the scratch and acid test for 18k gold, but I know stainless can often test that way. So using this to solve for density is a huge help.

[@SensibleSine]

weet thanks cody I was running into issues measuring the density of small objects recently. you're psychic haha! great video.

[@ND360]

Thanks for making these videos Cody! I am a big fan

[@alloeVideo]

Wow, that's an amazing trick! I never would have thought about that or the physics behind it... Now all I need is an accurate scale.

[@Orgyilkos]

Wouldn't the extreme surface tension ruin your measurement with Hg? For this small beads it might be important.

[@PDeRop]

Happy to finally understand this shit. It went right over my head when I was in school 25 years ago.

[@Why_It]

You make science and math sound fun to know. I'd love to actually learn how to do this kind of stuff, but I'm a lazy tool. Can't wait for the next video!

[@helikopterelidojosa5479]

Best Archimedes principle explanation video to date. (2nd best is from teded)

[@hebbejebbe]

Your measurement for the density of gold is almost exactly the same as the known value! Nice one.

[@HeYJaYHaX]

You taught me more in 8 minutes than my school did in 11 years

[@Rgmenkera]

Your channel is really inspirational!