What is the relationship between pressure and temperature in a closed container?

2009-03-01View Original

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It is a closed tank for storing liquid CO2; when it is full, the pressure is 20 BAR and the temperature is -19 degrees. As the amount of liquid inside decreases, the pressure drops to 15 BAR. The tank is insulated with vacuum. May I ask, based on the one-to-one relationship between temperature and saturated vapor pressure, should the pressure inside a closed tank remain constant when the temperature stays unchanged? For example, with CO2 cylinders available on the market, as long as the liquid inside has not been used up and there are no significant temperature changes, shouldn’t the pressure remain constant?

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What is the relationship between pressure and temperature in a closed container?

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