During mass measurement for a gas, why must you measure the gas, release some, and measure it again?
You have to provide more context. How are you doing the measurement ?
The gas is collected in a glass tube over water.
I think (but do not hold me to it) that it is so you can create a linear scale for the voume related to the mass.
Most likely this is wrong though.
The Bob (2004 ©)
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