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Pressure / Temperature relationship

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I have a question (and it probably sounds really stupid),

 

A closed vessel containing pure O2 has a tempreature of 20 degrees © and a pressure of 3000 psi. If it is heated to 800 degrees © what is the change in pressure and how do you work it out?

 

My Dad wants to know this for where he works, hes a welder / engineer by trade and apparently they're creating some kind of vessel thats going to do this.

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