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/sci/ - Science & Math

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3847143 No.3847143 [Reply] [Original]

Need help with a basic thermodynamics question.
"A closed tank contains wet steam at 400 F. The distance from the bottom of the tank to the liquid level is 10 ft. What is the pressure at the bottom?"
anyone for some help or hints

>> No.3847164
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3847164

>wet steam

>> No.3847168
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3847168

>wet steam

>> No.3847170

>wet dream

>> No.3847205
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3847205

>closed tank

this immediately popped into my head

>> No.3847208

>>3847164
>>3847168
>>3847170
From the problem statement it looks like it's just a water-steam mixture at 400 F.

Since the tank is presumably in equilibrium, this means the boiling point at the surface of the water is 400 F. Find what pressure that corresponds to, then add something like 4.6 psi for the weight of the water (do the actual calculation yourself, but I think that's about right).

>> No.3847240

>>3847208
>From the problem statement it looks like it's just a water-steam mixture at 400 F.

We gathered that much...

>> No.3847259

>>3847240
Then there's nothing all that unusual about the statement.

Ice-water mixtures are sometimes called "wet ice," after all.

>> No.3847346

>>3847208
Not op here but why add the weight of the water?

>> No.3847353

>>3847346
Because the pressure at the surface is not equal to the pressure at the bottom. The pressure at the surface must be at the boiling point, but the problem asked for the pressure at the bottom.

Ever dive deep underwater?

>> No.3847380

>>3847353
Ohhhh yeah, and thus the depth of the water is given. For some reason I read it as the bottom of the steam portion.

>> No.3847382

Wet steam means it is saturated
You know the temperature, so you can find the saturation pressure
then add in the pressure head from the liquid weight above the bottom