A manometer could also be referring to a pressure measuring device, usually limited to measuring pressures near to atmospheric. The term manometer is often used to refer specifically to liquid column hydrostatic instruments.
Liquid pressure is defined as the force all over area mathematically: P = F/A where" P is pressure with a unit of PASCAL F is force with aunit of NEWTON A is area wiht a unit of METER SQUARE
Density = mass/volume, so weigh a beaker, put your liquid in the beaker, weigh both beaker and liquid. With subtraction, find the weight of the liquid. Then, find the volume of the liquid with a...