The pressure within a partially evacuated container is being measured by means of an open-end manometer.?

This gives the difference between the pressure in the container and atmospheric pressure. It is known that a difference of 0 mm of mercury corresponds to a pressure of 1 atmosphere and that if the pressure in the container were reduced to 0 atmospheres, a difference of 760 mm of mercury would be observed. uming that the difference D in mm of mercury and the pressure P in the atmospheres are related by a linear relation, determine what such a relation is.