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STP = 273k and 1atm pressure

P1 x V1 = P2 x V2

---------- -----------

T1 T2

P1=1

P2=2

V1=2

V2=?

T1=273

T2=273

1 x 2 = 2(?)

-------- ---------

273 273

? = 1

so the volume halves from 2l to 1l

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