Boiled Water Audability

Is the boiled water cold or is it hot?

If it is hot it is just less dense.

If it is the same temp as un-boiled water it has less gasses suspended in it so it is denser.

The water has just been boiled ,make a cup of tea or coffee and give it a go ,listen to before boiled and after boiled .

Density of the fluid causes the change in sound. Also the increased moisture in the air as you pour conducts the sound differently.

It could be that the speed of sound waves in the cup is changing as the cup gets hotter. A cold cup will likely sound different than a warm cup - the pitch should drop as the cup gets warmer. Is this is what you hear?

Or maybe I should say it's not (necessarily) the 'speed' per se, but the stiffness of the cup that changes as it gets warmer, which affects the pitch.

If it is speed of the sound waves that is altering the sound , if you pour boiling water into a glass the glass will break,if you put a spoon into the glass before you add the boiling water the glass will not break, is it the sound waves that break the glass or the heat ?

The velocity of sound in the hot water is different, making the resonant frequencies different for hot water than cold water. It's the same effect as breathing helium changing the resonant frequencies of your voice.

Why does hot water sound different to cold water when poured ...T

he sound of pouring water - Tilted Forum Project Discussion ...

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Top answer ,boiling water must have different properties because if you put cold water on a teabag very little happens but when you put boiling water on a teabag the infusion is very evident. Is the reaction thermal or harmonic ?

Boiling water would have a different viscosity and surface tension than cold water, which would help to explain the faster absorption rate of hot water.

Not sure if harmonics plays into this at all, but molecular action would be greater in the hot sample.

I believe that when adding heated water into a tea bag, you just have added heat that served as a catalyst thereby speeding up /and triggering the chemical processes. Have a nice tea!

Sounds travel faster in solids. Most material tend to solidify when frozen . That's why audibility is dependent to temperature- cooler most audible than hotter ones in general.

In Vacuum there is no sound at all.

What you say makes no sense at all, in relation to hot water.

Does sound travel faster in hot water??

Sound is characterized by molecular vibration(wave form), mechanical in nature.

Below is the explanation of wikepedia, best to explain relationships to sound

http://en.wikipedia.org/wiki/Speed_of_sound

Nope, sounds travels faster in cold water rather than hot water, the same effect to surroounding air.

Correct.

With no sound in vacuum,is sound more audible in a compressed situation. Would sound be more pronounced at higher altitudes compared to sea level ?

Sound is a function of density. More dense, faster sound propagation.

Higher altitude less dense.

Speed of sound - Wikipedia, the free encyclopedia

Should we be listening and watching movies in a compressed air environment to increase

the entertainment value ?

No. Use head phones.

Commonsense prevails.

Boiled water has no dissolved gases. It can have a different compressibility from water saturated with air.

You are also changing the "resonance" of the cup...it's size will change with cold or hot. One will contract the cup, the other will expand it making the resonance different.

If it is speed of the sound waves that is altering the sound , if you pour boiling water into a glass the glass will break,if you put a spoon into the glass before you add the boiling water the glass will not break, is it the sound waves that break the glass or the heat ?

The heat, the BTU transfer to the glass makes the glass expand too fast. The spoon not only cools the water off just a little it also disperses the water so the heat is more evenly distributed. Ceramic has a much lower heat explanation factor than glass and borosilicate is somewhere in-between.

One last thing, the actual breaking is due to one small part to the glass expands rapidly while the rest does not. By slightly cooling and spreading the flow more of the glass expands and a bit more slowly. I bet you could prevent the glass from breaking if you allowed only a table spoon of hot water hit the bottom of the glass then wait for a second before you poured normally.

Pouring boiling water or cold water into your ear also sounds quite different.