A contact angle is the angle made by the tangent drawn to the free surface of a liquid to the surface of a solid measured from inside the liquid. Overview of Contact Angle If we observe the liquids around us carefully, some liquids partially wet solid surfaces, other liquids completely wet solid surfaces, while some liquids like mercury do not.

Thus, a gas fills the vessel completely in which it is kept. b) Because of the negligible force of attraction between particles of gas, the particles of gas have the highest kinetic energy. These properties enable the particles of gas to move in all directions and hit the walls of a container from all sides.

Volume at NTP of oxygen required to completely burn 1 kg of coal ( 100 % carbon) is: A 22.4 L B 22.4×10 3 L C 1.86×10 3 L D 1000 L Medium Solution Verified by Toppr Correct option is C) Mass of C=1000 g Moles of C= 121000=83.34 moles C + O 2 CO 2 1 moles C requires 1 mole O 2 to burn. So, 83.34 mole C requires 83.34 moles O 2