💎Pressure = Force/Area

💎SI unit is Pascal

💎1Pa = 1N/m-2

💎It is the simplest method of pressure measurement

💎lt does not need calibration

💎So it can be used to calibrate other devices

💎The pressure is balanced against a column of liquid of known density – usually water for low pressures and mercury for higher pressures

💎The pressure is equal to the depth multiplied by the liquid density multiplied by the acceleration due to gravity; hence the commonly used units cm of H2O and mm of Hg

💎Mercury is 13 times more dense than water

💎The vertical height gives the pressure value