- Books Name
- Kaysons Academy Chemistry Book

- Publication
- Kaysons Publication

- Course
- JEE

- Subject
- Chemistry

**SURFACE TENSION**

Surface tension is defined as the force acting per unit length perpendicular to the line drawn on the surface of liquid. It is denoted by Greek letter γ (Gamma). It has dimensions of kg s^{-2} and in SI unit it is expressed as N m^{-1}.^{ }Surface tension reduces with increase in temperature.

**SURFACE TENSION VS. TEMPERATURE PLOT **

**VISCOSITY**

It is one of the characteristic properties of liquids. Viscosity is a measure of resistance to flow which arises due to the internal friction between layers of fluid as they slip past one another while liquid flows.

F A (A is the area of contact)

F (where, is velocity gradient)

‘n’ is proportionality constant and is called **coefficient of viscosity**.

Viscosity coefficient is the force when velocity gradient is unity and the area of contact is unit area.

SI unit of viscosity coefficient is Newton second per square meter (N s m^{-2}) = Pascal second (Pa s = 1kg m^{-1}s^{-1}). In cgs system the unit of coefficient of viscosity is poise

1 poise = 1 g cm^{-1}s^{-1} = 10^{-1}kg m^{-1}s^{-1}

**IMPORTANT FORMULA**

- Ideal gas PV = nRT =
- Graham’s law of diffusion
- Separation by diffusion f=n1'n2'n1n2=AfterBefore f1=M2M1=one stage separation f1=f here x=no. of shape Kinetic Theory PV = 1/3 mnv
^{2}_{rms } - Kinetic Energy/mole = 3/2 RT
- Kinetic Energy/molecule = 3/2 kT k(Boltzmann constant) =R/N
_{A} - v
_{rms}**:**v_{avg}**:**v_{MP }=_{ }1.224**:**1.128**:**1 = 1**:**0.92**:**0.816 - Vanderwaal’s Gas
- Boyles temp T
_{b}= - Critical constants
- Inversion temperature
- C
_{p}– C_{V}= R and C_{P}/C_{V}= g - Compression factor Z = Z = 1 for ideal gas (Z < 1 lower P Z > 1 higher P)
- C
_{p}– C_{v}= R and C_{p}/C_{v}= g