# Thermal Expansion, Change in Temperature

• Sun44
In summary, thermal expansion is the change in volume, length, or shape of matter in response to a change in temperature. It is caused by the increase in kinetic energy of particles as they are heated, affecting all materials to some degree. This can cause objects to expand or contract, leading to changes in size, shape, and structural integrity. Thermal expansion is measured using the coefficient of thermal expansion, which measures the rate of change in length or volume per unit change in temperature.
Sun44

## Homework Statement

""If the coefficient of thermal expansion of steel is 1.1 x 10^ -5 ℃^ -1 and a railway rail is 4. 5 m long, how much would the length Δ L of the rail increase by if the temperature changes from -10 ℃ to 30 ℃? ""

Could anyone direct me to a youtube video, or something that could help understand how to work this out and get the answer.

Im not sure

## The Attempt at a Solution

See: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/thexp.html"

Last edited by a moderator:

## What is thermal expansion?

Thermal expansion is the tendency of matter to change in volume, length, or shape in response to a change in temperature.

## What causes thermal expansion?

Thermal expansion is caused by the increase in kinetic energy of particles as they are heated, causing them to vibrate and take up more space.

## What materials are affected by thermal expansion?

All materials are affected by thermal expansion to some degree, but some materials, such as metals, expand more than others.

## How does thermal expansion affect objects?

Thermal expansion can cause objects to expand or contract, depending on the direction of the temperature change. This can lead to changes in size, shape, and even structural integrity.

## How is thermal expansion measured?

Thermal expansion is measured using the coefficient of thermal expansion, which is the rate of change in length or volume per unit change in temperature.

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