Re: Well, what about that tank of hot?

"George Cathcart" <aquadiver@xxxxxxxxxxx> wrote

>A tank heats when filled too fast. When it cools, the pressure
> decreases.

The same amount of heat is generated no matter how fast or slowly the tank
is filled.

> It's the aspect of Boyle's Law that too many shop monkeys
> don't understand.

Mine do. Sorry about yours.

> The volume of gas in a hot filled tank is not as great as the pressure
> reading suggests. The true volume is the volume
> equivalent to the pressure at room temperature.

The true volume, in terms of the amount of gas contained in the tank, can be
expressed only in terms of molecules or some measure of them. Neither cubic
feet nor liters does that.

> Boyle's Law states that pressure and volume are inversely related at
> constant temperature. If you let the temperature > rise (by filling too
> fast), you have screwed up the relationship between pressure and volume,
> and you have to wait
> until the tank cools before you can calculate the true volume.

Say what?

> There is no such thing as an "amount of cold." Cold is merely the
> absence of heat.

Well, at least you got one thing right.

> Boyle's Law doesn't account for time. The reality of filling or emptying
> tanks is that the faster you fill them, the
> hotter they get . . .

That's two more things right.

> and the faster you empty them, the colder they get.

That's one more right. You're doing better.

Lee


.

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