How, in a gravity free environment, do you weigh air? You can calculate loss of air mass (not weight) by measuring pressure loss within a known volume (i.e. a

How, in a gravity free environment, do you weigh air? You can calculate loss of air mass (not weight) by measuring pressure loss within a known volume (i.e. a space station module). This pressure differential corresponds to a certain volume of air which in turn corresponds to a particular weight back on earth.