What will cause a decrease in gas pressure in a closed container?

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Answer 1 · 2017-06-26T14:59:22

leak on the container tank.

Drop in temperature will reduce pressure
leak in safety valve..Faulty gauge.

Answer 2 · 2018-07-25T15:53:18

Reduction of temperature?

#P.V = nRT#

P is pressure, V volume, n amount of substance, R is gas constnat and T temperature.

Amount of substance is constant, the gas constant R is obviously a constant, and it's a closed container so volume V is also constant.

So with V, n and R all being constant, P is proportional to T. In other words, reduce temperature = reduce pressure.