1.write the physical quantities
b] . pressure
2. with the help of a labelled diagram explain a method to separate a mixture of ammonium chloride and sodium chloride .
1. b] Pressure is the force per unit area applied in a direction perpendicular to the surface of an object. a] The density of a material is defined as its mass per unit volume. 2. Sodium chloride and ammonium chloride can be separated by sublimation. (Ammonium chloride appears to sublime upon heating).