Mass vs. Density

Does one candle float because it's bigger?
This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - elearning.flinn...
ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.
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[@karen9244]

Bro I can't keep a straight face, I feel like this is going to turn into an SNL skit!!

[@erazembalkanski28]

Nice improvement of a kitchen scale: kzbin.info/www/bejne/q2bWfpt-ZdeEo6M

[@mousehead2000]

the density of the liquid was my first response.

[@kshitijgour8989]

Not a clear explanation,confusing, only revolving around the subject. If you are teaching your students this way they are preparing to fail

[@marklvrd]

It's okay if you thought the candles were different pieces, it takes time for people to learn, that is the fun part.

[@lyricgirl2012]

my son age 7 understood but got it wrong. we both thought it was because one was hot and the other was cold. we tried with 2 of the same balls in some cold water and they floated and then placed them in hot waster and they sunk. they kept sinking inside the hot water and also tried repositioning like you said in the video and they sunk a few times in the cold water. thank you for explaining your video. I understand clearly when I follow along.

[@daisy-bugs]

May I just say that I understood this perfectly, and that not everyone learns the same way, and therefore even if you can't wrap your head around this by taking a step back, other people can, and shows people how they learn, so really, the only failure is on the end of the student who doesn't try.

[@ideservehealth]

what is the "other" liquid?? Since she said its flammable, I am assuming it was alcohol?

[@jaymo142]

Teacher: *don't be condescending, don't be condescending* Teacher: immediately condescending

[@mishmashvideo6124]

Thank you for making this video. It really helped! 😃

[@kenpatterson3052]

My guess is rubbing alcohol. I do the same thing with ice cubes....they float in water, sink in alcohol.

[@marka2520]

Not a good lesson. You gave the impression the liquids were the same. Science needs to be specific, not vague. A better display would be to have two different liquids of different colours to display their density. I'm sorry but your zeal to force kids to think will actually switch them off. Amaze them and they will think.

[@drewking07]

Agree

[@Rachie-nj3oi]

It's an amazing lesson. It gets them to question and think about things. It's teaching them it's not about the weight of the objects. It's not because one's heavier or lighter than another. Eg a tiny rock sinking in water but a huge ship floating on water, because its not about the weight. Its about the relative density. The objects density relative to the mediums density. Both candles were the same density but were not the same weight.

[@marka2520]

@@Rachie-nj3oi Yeah, they'll think, "You cheated"

[@Rachie-nj3oi]

@@marka2520 no they will realise things aren't always as they seem and then they get to figure out the real reason why. I suppose its more for intellectuals who have curiosity and like to question things rather than everything being drip fed them. It's not cheating its getting them to think and use their brains, how can you think that's a bad thing?

[@marka2520]

@@Rachie-nj3oi watch the video again. She quite clearly states that the liquid in both beakers is water. Then admits that they contain different liquids at the end. If they are led to believe that both beakers contain the same liquid how can they work out that it's the liquid's density that makes the difference. Also, aluminium used in the canning industry does not degrade in water.

[@juliebrod4756]

Thank you so much. I love to introduce concepts with discrepant events- very engaging. Is the liquid alcohol?

[@natek8538]

BUT GOOD TEACHING I LOVE SCIENCE

[@shreenarayansabannavar9212]

for various reasons i didnt like this video.. she is very discouraging..

[@charbelalamil6012]

yes your right

[@iftikharhussain7175]

Agree

[@180DegreeMason]

I'm just sitting there knowing she has rubbing alcohol the whole time in the other flask.

[@karieclingo8328]

She looks like a fun teacher! Much better than most i've had.... I guess it's all about perspective and experience. Criticism comes from minds who have never taught= IE: they are more dense people. Lighten up and you'll float more through life ;-)

[@axypolyas]

Karie Clingo Nice! Agreed.

[@daisy-bugs]

Well said. For those who try to say this is a bad teaching method, I'd just like to say, not everyone learns the same way, and therefore even if you can't wrap your head around this by taking a step back, other people can, and shows people how they learn, so really, the only failure is on the end of the student who doesn't try to learn the way they can.

[@keith.anthony.infinity.h]

Archimedes’ Principle. The buoyant force acting on a submerged body of mass = the weight of the displaced water. If the difference of the candle’s density and the contained liquid’s density goes to negative the candle will float. And if the difference of the candle’s density and the contained liquid’s density goes to positive the candle will sink.

[@rosaescamilla1]

Really, what was the flammable liquid?

[@justinchambers3619]

I agree with Ken, I also think it's rubbing alcohol.

[@truthseeker3910]

Thanks great upload

[@VijayRamanathanphotography]

this one is based on archimedes principle

[@Unaomnia01]

This is perfect!

[@muslimbelal445]

good explaining

[@Samuelpauline008]

good teaching..

[@rochadson]

Love it, Thank you

[@JesseMason]

Such a great demo! But an awful explanation for the motion of these objects. All bodies accelerate due to imbalanced forces - in this case, the weight force and the buoyant force. While density is necessary to explain this behavior, density itself is not sufficient to do so.

[@shwetamane6004]

bro i don't understand please explain me na

[@ramawatarmeena9876]

mam I like your teaching

[@mumenrider862]

Sleeping Warrior brought me here... great debunking of "gravity!"

[@sleepingwarrior4618]

Correct!

[@mumenrider862]

@@rrrick2129 Right.. because gravity isn't a thing. Welcome to flat earth.

[@mumenrider862]

@@rrrick2129 Love the word games... it's really all you got. Unless you have proof of this "gravity". (oh, please say "drop a brick on your toe." lol!)

[@RoyAndrews82]

Things float because the weight of the size of the object weighs less than the weight of the size of the liquid it displaces... Roughly speaking.

[@DivergentDroid]

That's a good way to put it. I would call that anti gravity wouldn't you? You observe an object rise so there must be a force from the sky that's pulling the object up right? Of course that's silly but it's exactly what people believe when they say the ground has a force called gravity that pulls things down. There is no mass attracting mass, no space time. Gravity is the false but popular name we give to the downward effect of objects falling because they are heavier than the amount of medium they displace. Everything is always trying to get back to their natural state, equilibrium. Gravity, destroyed.

[@georginacerda4825]

What is the flammable liquid?

[@JKnight]

First thing that came to mind when she swapped between was that the left liquid was not water.

[@diamondreactor9863]

Ok Less dense object + Denser liquid (Water) = Object Floats Denser object + Less dense liquid (Oil) = Object Sinks

[@zedisdeadz]

It would be more clear if the items where of the same size.

[@stormtrooper9119]

Theres a sugar in a pitcher. basic

[@TheSYmPHONICNV]

Who invented the MASS of the Earth? What is the MASS of the Earth?

[@j0mezzy]

This was a good lecture.... although you seem like a mean teacher :O

[@clementramccoy9357]

Wow

[@jt-kp5li]

I bet students were confused during her class. She needs to improve her demo.

[@jeffreyarroyo2779]

Wow! Amazing ^_^

[@shwetamane6004]

water is rising

[@thechallngers2259]

so compilicated

[@roosteroriginal6458]

Because gravity is dumb. Earth is flat ;)

[@sadewkawshalya6267]

🤣😂

[@donniexl1033]

Peggy Hill

[@iwannabeadoor4035]

It needs to be a bit more to the point, I think she put salt in the water

[@User-0jifs34wuie2]

I wish that helps me for real and I have a headache of science of d=m/v😅😅😅

[@prashantkunder515]

What I wanna know is she a he or she?

[@venkatesanisaac3074]

Super sir

[@cheese-nu6ul]

wut

[@breanna1299]

I agree with ken also, because he is really cute ;)

[@fatmaelzahraam8960]

u

[@cupofjamal043]

I'm triggered

[@willyspinney1959]

At the beginning she makes a big fuss of filling both containers with water. (She even tops the one which is not water with water from her jug). So how are her students to know that one container is not water. Very stupid and confusing way of teaching. No wonder she says her students don't understand what density means.

[@saqeebchand9641]

spamming is awesome

[@jasonpwnd]

As someone who knows this professionally, I love your enthusiasm! However when I try to watch your lesson objectively, I feel deceived. And it’s a fun deception, don’t get me wrong. But I think you’re putting the cart before the horse here with the lesson. You’re showing trick before the principal of the lesson (density). Which may seem deceptive and off putting (people like to be right with their guesses). So maybe next time try floating the candle pieces both in water, observe they both float. And then go to fill another flask with water, accidentally “drop” it below vision, and pick up your other flask that’s not water and then play your density depends on the object lesson. Just my humble suggestion. I did like the lesson a lot though!

[@Jasonatis1]

pure comedy

[@virginiajabile8068]

Its good but I disliked it cause Its too.... Um.... COMPLICATED !!!! Sorry but this is in my own opinion..... PEACE!!

[@peelingwithstephen]

I didn't know she was a women at first...

[@jonneagle7028]

I realized that was a girl after 5 minutes

[@yassbih7673]

same omg

[@UTUBESUCK666]

As long as you immediately realized it is a human being, all is good.

[@futurewwesuperstars7235]

lame

[@Blast66666]

Yeah I know, Science is lame, and anything that utilizes it is also lame...such as Wrestling.

[@natek8538]

IS THAT A GUY OR A GRL?????!?!?!?!?

[@UTUBESUCK666]

It's a human being, which is more than enough for me. She's also obviously female...

[@drewking07]

Boooo

[@jonathanguerra1501]

Students dont understand density But i do cuz I'm the teacher i know more 😂😂😂😂😂😂😂

[@hiddenrealms9334]

Is this a scientific clown show?

[@LukaJankovic]

Are you a woman or a man????????

[@daisy-bugs]

Why are you trying to assume their gender?

[@superjack0814]

@@daisy-bugs Yessss

[@akshaykhairnar3266]

Please let me know which different solvent is added in in both? Please...