Physics Properties of Solids and Liquids Syllabus for NEET 2026

The Physical Properties of Solids and Liquids explain how matter behaves under the influence of force, pressure, temperature, and heat. This unit helps in understanding the deformation of solids, the flow of fluids, thermal effects, and energy transfer in different states of matter.

It includes important topics like elasticity, viscosity, surface tension, fluid dynamics, calorimetry, and heat transfer. These are widely connected to both theoretical concepts and real-life applications in Physics.

Mechanical Properties of Solids

Elasticity is the property of a material to regain its original shape after the removal of force. Stress is the restoring force per unit area, while strain is the fractional change in dimension.

Hooke’s Law states that stress is directly proportional to strain within the elastic limit.

Important elastic moduli include:

• Young’s Modulus → Longitudinal elasticity

• Bulk Modulus → Volume elasticity

• Modulus of Rigidity → Shear elasticity

These concepts explain the deformation and elastic behaviour of solids.

Fluid Pressure and Fluid Dynamics

Pressure in fluids depends on depth, density, and gravity. Pascal’s Law states that pressure applied to a confined fluid is transmitted equally in all directions.

Fluid flow may be streamline or turbulent depending on velocity. Critical velocity determines the transition between these flows.

Bernoulli’s Principle relates pressure, velocity, and height of a fluid and explains applications like airplane lift, atomizers, and venturimeters.

Viscosity and Stokes’ Law

Viscosity is the internal friction between layers of fluid that opposes motion. Highly viscous fluids flow slowly.

Stokes’ Law explains the viscous force acting on a spherical body moving through a fluid. Terminal velocity is achieved when gravitational force balances viscous drag and buoyant force.

These concepts are important in fluid mechanics and motion through liquids.

Surface Tension and Surface Energy

Surface tension is the force acting on the surface of a liquid due to cohesive forces between molecules. Surface energy is the energy required to increase surface area.

Applications include the formation of drops, bubbles, and capillary rise. Angle of contact determines the interaction between liquid and solid surfaces.

Excess pressure exists inside liquid drops and soap bubbles because of curved surfaces.

Thermal Properties of Matter

Heat is a form of energy transfer due to a temperature difference. Temperature measures the degree of hotness or coldness.

Thermal expansion explains the increase in dimensions of substances with temperature. Specific heat capacity defines the heat required to raise the temperature of a substance.

Calorimetry deals with heat exchange between bodies. During a change of state, substances absorb or release latent heat without a temperature change.

Heat transfer occurs through:

• Conduction → Transfer through direct contact

• Convection → Transfer through fluid motion

• Radiation → Transfer without medium

Properties of Solids and Liquids: Study Resources By PW

To strengthen your preparation, Physics Wallah provides study material for quick revision, practice, and concept clarity in Properties of Solids and Liquids.