Q1: 1 torr is equal to __________ mm Hg column.

ANS:A - 1

The torr and the millimeter of mercury (mm Hg) are both units of pressure and are often used interchangeably in many contexts, particularly in the field of fluid mechanics and vacuum technology. The torr is a unit of pressure named after Evangelista Torricelli, who invented the mercury barometer. It is defined as the pressure exerted by a column of mercury 1 millimeter (mm) in height at 0°C under standard gravity (9.80665 m/s²). The torr is commonly used to measure pressures in vacuum systems and in scientific research. On the other hand, the millimeter of mercury (mm Hg) is a unit of pressure also derived from the height of a column of mercury. It represents the pressure exerted by a column of mercury 1 millimeter in height at the standard acceleration due to gravity at sea level (approximately 9.80665 m/s²). Because of their definitions, 1 torr is equivalent to 1 millimeter of mercury (1 mm Hg). This means that the pressure of 1 torr is equivalent to the pressure exerted by a column of mercury that is 1 millimeter in height. Therefore, 1 torr is equal to 1 mm Hg column. This relationship allows for easy conversion between the two units when measuring pressure, particularly in vacuum systems or when discussing atmospheric pressure.