# What is Thermal Stress in Physics? | Definition, Formula – Elasticity

Thermal Stress Definition:
When temperature of a rod fixed at its both ends is changed, then the produced stress is called thermal stress.

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## What is Thermal Stress in Physics? | Definition, Formula – Elasticity

“Stress caused due to the change in temperature”

Thermal Stress Formula:

Thermal stress = $$\frac{F}{A}$$ = Y α Δθ

where, α = Coefficient of linear expansion of the material of the rod.
When temperature of a gas enclosed in a vessel is changed, then the thermal stress produced is equal to change in pressure (Δp) of the gas. Thermal stress = Δp = Kγ Δθ

where,
K = Bulk modulus of elasticity
γ = Coefficient of cubical expansion of the gas.

Elasticity:
Elasticity defines a property of an object that has the ability to regain its original shape after being stretched or compressed. Learn about the deforming force applied on an elastic object and how the stress and strain works on an object. What is a Hooke’s law and how it is applicable for the concept of elasticity.