A certain gas initially at 0.050 L undergoes expansion until its volume is 0.50 L. Calculate the work done  (in joules) by the gas if it expands (a) against a vacuum  and  (b) against a constant pressure of 0.20 atm.  (The conversion factor is 1 L ⋅ atm = 101.3 J.)

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.