The Speed of Sound - Sound Speeds

Most people know that sound travels slower than light but did you know that sound travels slower on top of a mountain or faster if the air is humid? In this video we go over all the different factors that help to shape the speed of sound.
For more info: en.wikipedia.o...
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[@ashutoshbhakuni303]

Again a wrong explanation. Speed of sound is inversely related to density...it decreases with density. Google its equation. The reason it increases in solids or liquids compared to air is because of the increased elasticity of the medium to which the speed is directly related. The increase in elasticity dominates the increase in density and so overall speed increases. With 2 solids of same elasticitt but different densities, speed is more in lower density solid. Similarly for same elasticity of air and helium, the speed is much more in less denser helium. Thats why u have the funny voice after inhaling helium. This is a common misconception that u have also fallen prey to...it mistakes correlation ('speed is observed to increase in more denser medium') for causation ('speed increases BECAUSE of increse in density of medium' which is WRONG). Your other video in swimming pool also doesnt measure the speed of sound in air and water.

[@SoundSpeeds]

Pinning your comment. BTW, I love the "again a wrong explanation".

[@007ETA73]

Could you do a new video correcting this so there's not miss information floating out there (no pun intended). I didn't know this video was incorrect until I saw this comment and I don't usually read the comments. Then I watched this kzbin.info/www/bejne/r3eXlKmYdr6dras

[@igor6388]

2:40 My teacher was wrong ! She told me i was wrong and that sound travels slower in hot air. Good video

[@SoundSpeeds]

Depending on your age, there may be new info since you went to school. The info in this video is accurate

[@soundrolling]

love it as always :)

[@SoundSpeeds]

Thanks Matt!

[@1markejx]

I’m interested in using sound transmitted through 1” underground water pipes to find and repair leaks. Will use listening devise above ground to track path of pipe. What type of sound is best for this application? High pitch vibration? Rat tat tat like an impact wrench or something else? Sound will need to travel in pipe 100 linear feet +/- Thanks in advance for any insights you can provide.

[@SoundSpeeds]

I have no experience with that and it's waaaaaay outside of my area of expertise. Thinking acoustically, I wouldn't think it works best low frequency though. Totally don't know though. Sorry.

[@the_real_patrick17]

How come if you yell underwater it’s not louder and doesn’t travel farther then,

[@SoundSpeeds]

Because it starts in air (your mouth) and loses a lot of energy when it moves to water. When you're underwater you can hear muffled sound of people talking outside in the air but if a watch starts beeping, you'll hear that across the pool

[@kickapoo1390]

great video!

[@SoundSpeeds]

Thank you!

[@omeshsingh8091]

1. If a sound (e.g. a distant blast) is measured to be 82dB at a distance of 8000km from its source, how loud was it at a distance of 16 meters? 2. Will this sound be powerful enough to break window panes, and if so how far away from the source does this risk of breaking glass extend?

[@SoundSpeeds]

1) Approx 136 dB depending on conditions. 2) It's very possible. Depends on what the glass is, how it's made and what it can endure.

[@omeshsingh8091]

@@SoundSpeeds 136dB feels like it would be too small. I think you may have misread my first question. The long distance is 8000km (or 8 million meters which is roughly the distance from New York To Greece) and the close distance of 16m is slightly wider than a basketball court.

[@SoundSpeeds]

Your right, I misread. Approx 192dB in perfect conditions but that would exist in earth because one condition would be line of sight. It also exceeds the maximum SPL without distorting. kzbin.info/www/bejne/qaW3aZyFpph_iac

[@marjiadair7736]

Why does sound travel faster in saltwater than freshwater? You might have explained that--so I apologize if I'm asking for clarification.

[@SoundSpeeds]

In short... higher density.

[@Gregg0Palmer]

You should twist this a little and talk about sound in terms of time. A different, maybe more useful, way to look at 343m/s is 1m takes 3ms (or 1 foot = 1ms) to travel. I keep this in mind from the standpoint of a lav mic and a boom mic, sound typically reaches the boom 1-2 ms after the lav. Does this mean you should not mix the two together in post? Additionally, given that in real life there is always some delay between the visual action and audio, what is the tolerance of audio perception as we view a film/video? How late or early can audio be and still be perceived to be in synch? Should audio be exactly in synch with the action or should we mimic real life where audio is always after the visual and the delay is relative to distance from the source? ....In other words, if there is an explosion on screen where do you place the boom?

[@SoundSpeeds]

All are excellent points. Mixing lavs and booms is purely an ear thing as I'm sure you know. Phasing could happen on one set because voices bounce off a wall but not on another even though the mics are in the same place. Mixing is much more of an art than people give it credit for.

[@EU_DHD]

If you dropped a bowling ball on the moon, wouldn't it make a sound in the moon itself?

[@SoundSpeeds]

You'd have to have your ear or some sort of mic on the moon itself to pick up the vibration. Other than that, not even 1 millimeter away would you hear the sound.

[@EU_DHD]

Huh, cool. Anyway. New subscriber here :)

[@SoundSpeeds]

Welcome!