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The problem here is, you don't know the temperature inside the cylinder when the fill is hot, but if you fill slowly and allow to cool, assume it's at ambient.

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Cheers Nick, I understand that in theory, The example I have is a cylinder filled to 200 bar at ambient temp of 26c then dropped into water of 7c. I know I need to add 1 to the pressure thus 201 bar to account for surface pressure, I know that I need to convert C to kelvin thus adding 273 to both temperatures to arrive at a kelvin figure but I'm in a mess from there on. I'm sure that you or pretty much most people could give me the answer but I need to get my head round doing it for myself.

The problem here is, you don't know the temperature inside the cylinder when the fill is hot, but if you fill slowly and allow to cool, assume it's at ambient.

Note that the temperatures are Kelvin here as they need to be absolute.

You can leave the cylinder size out to make the numbers easier. In your example:Cheers Nick, I understand that in theory, The example I have is a cylinder filled to 200 bar at ambient temp of 26c then dropped into water of 7c. I know I need to add 1 to the pressure thus 201 bar to account for surface pressure, I know that I need to convert C to kelvin thus adding 273 to both temperatures to arrive at a kelvin figure but I'm in a mess from there on. I'm sure that you or pretty much most people could give me the answer but I need to get my head round doing it for myself.

200/299 = x/280

200*280/299 = x

x = 187.3

What temperature is the whiskey?thanks Nick, between you and Sue and a glass of whiskey I think I've got it.

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Didn't have time to warm up, let me try that again...If the pressure stays constant and you let it warm-up a bit ...........

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I drank all the whiskey, he's just got the whisky - the temperature is a bit superfluous in this exampleWhat temperature is the whiskey?

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But that's only when my towel is dry.

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