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To measure a physical quantity correctly and need to compare it with some standard quantities. Thus a standard unit is needed to measure a quantity correctly.
Gross volume is the volume at actual condition whereas standard volume is at standard Pressure/Temperature condition.
It is Centigrade sometimes called Celsius.
bromine at stp is a liquid
The standard deviation is a measure of how spread out the numbers are. Three points is needed to calculate a statistically valid meaningful standard deviation.