6 ms·

This was interesting so I looked it up >For a given ideal gas the molecular composition is fixed, and thus the speed of sound depends only on its temperature.

This was interesting so I looked it up >For a given ideal gas the molecular composition is fixed, and thus the speed of sound depends only on its temperature. At a constant temperature, the gas pressure has no effect on the speed of sound, since the density will increase, and since pressure and density (also proportional to pressure) have equal but opposite effects on the speed of sound, and the two contributions cancel out exactly. https://en.m.wikipedia.org/wiki/Speed_of_sound#Dependence_on_the_properties_of_the_medium https://en.m.wikipedia.org/wiki/Speed_of_sound#Dependence_on...

bongodongobob 3y ago
I never knew this either. This makes sense as when you tap on a propane tank they always sound empty, different than a metal tank of water. Even though it's a liquid and under extreme pressure, it's only the temperature that matters.
- thfuran 3y ago
  Liquid propane is definitely not an ideal gas.
  - bongodongobob 3y ago
    Not saying it is, but it's very volatile. It really doesn't want to be a liquid at room temperature. I can't tell if it's empty or full when a tap on it, but definitely can with with water. It's an impedance thing.
    - thfuran 3y ago
      I'm just saying a fact about ideal gases doesn't really imply anything about LP.
      - bongodongobob 3y ago
        It does, vapor pressure.
        deleted 3y ago
        [deleted]
        nautilius 3y ago
        That's got nothing to do with some fluid behaving like an ideal gas or not. Also, except for very low pressures, vapor does not behave like an ideal gas.
        bongodongobob 3y ago
        Sure it does, it's riding the border of a phase change between gas and liquid. It's in a super compressed equilibrium so it's going to behave similarly to an ideal gas.
        nautilius 3y ago
        That's - not how that works. I suggest you look at any fluid data `riding' that border. "Super compressed" and "ideal gas" are mutually exclusive. "Equilibrium" has even less to do with any of that.
- jldl805 3y ago
  That's because propane tanks are only 1/4 full even when filled to max capacity.

bongodongobob 3y ago

I never knew this either. This makes sense as when you tap on a propane tank they always sound empty, different than a metal tank of water. Even though it's a liquid and under extreme pressure, it's only the temperature that matters.

thfuran 3y ago
Liquid propane is definitely not an ideal gas.
- bongodongobob 3y ago
  Not saying it is, but it's very volatile. It really doesn't want to be a liquid at room temperature. I can't tell if it's empty or full when a tap on it, but definitely can with with water. It's an impedance thing.
  - thfuran 3y ago
    I'm just saying a fact about ideal gases doesn't really imply anything about LP.
    - bongodongobob 3y ago
      It does, vapor pressure.
      - deleted 3y ago
        [deleted]
      - nautilius 3y ago
        That's got nothing to do with some fluid behaving like an ideal gas or not. Also, except for very low pressures, vapor does not behave like an ideal gas.
        bongodongobob 3y ago
        Sure it does, it's riding the border of a phase change between gas and liquid. It's in a super compressed equilibrium so it's going to behave similarly to an ideal gas.
        nautilius 3y ago
        That's - not how that works. I suggest you look at any fluid data `riding' that border. "Super compressed" and "ideal gas" are mutually exclusive. "Equilibrium" has even less to do with any of that.
jldl805 3y ago
That's because propane tanks are only 1/4 full even when filled to max capacity.