Question

why does matter expand when heated ​

Answer 1

Answer:

Simply put, matter expands when heated because there is a rise in kinetic energy of the individual molecules.

What this means is that, when heated, the molecules are full of energy, and because they are full of this energy they can't sit still so they start running around and moving about like crazy people.

Since the molecules are moving around a lot more when heated the distance between them increases (because they bounce off of each other and push other molecules farther away). Since the distance between them increases so does the actual compound, material, or what have you, they compose.

The opposite happens with cooling. When you cool them, you take away kinetic energy and slow them down. They don't move around as much so molecules can get really close to each other.

Answer 2

When a matter is heated, it undergoes a process called thermal expansion, which causes it to increase in size.

• As heat is added to matter, the temperature of the molecules and atoms within it increases.
• As the temperature increases, the kinetic energy of the molecules and atoms also increases.
• This increased kinetic energy causes the molecules and atoms to vibrate and move more rapidly.
• As the molecules and atoms move more rapidly, they begin to push against one another more forcefully.
• This increased force between molecules and atoms causes them to spread out and take up more space.
• The expansion is proportional to the temperature change and the coefficient of thermal expansion of the material.
• Different materials have different coefficients of thermal expansion, meaning that they will expand to different extents when heated to the same temperature.
• Thermal expansion is an important consideration in many engineering applications, such as the design of bridges and buildings, as it can cause structures to deform or even break if not taken into account.

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