# What is heat? what is kinetic energy?

• blackbird3
In summary, heat is the energy transferred from one object or substance to another due to a temperature difference. Kinetic energy is the energy a particle has due to its motion. Temperature is a measure of the average kinetic energy of the molecules or atoms an item or substance.
blackbird3
This may be a very stupid question but I've got no scientific background so stick with me. When talking at the level of atoms or atomic particles, what is meant by the notion of heat "transferring" between particles? People often use language that suggests heat is a thing or a kind of particle in itself. Is this literal or is heat better understood as a kind of effect particles have on each other? Whichever case is true, how do we know?

The same thing applies to kentic energy - when one particle causes another to move, is something literally being exchanged between them?

kinetic energy is a measure of the movement of an object, and heat is a measure of the random movement of an object.

When two gases (initially at different temperatures) come together, the molecules literally collide with one another (which naturally tends to slow the more "energetic" molecule whilst suddenly speeding up the slower one a bit) until the whole volume has a uniform temperature.

Heat is the energy transferred from one object or substance to another due to a temperature difference. Kinetic energy is the energy a particle has due to its motion. Temperature is a measure of the average kinetic energy of the molecules or atoms an item or substance. As explained above, when two substances come together at different temperatures the kinetic energy is transferred from one substance to the other by the molecules or atoms colliding with each other. When they collide their average kinetic energy changes (because the molceules or atoms motion is affected by collisions) and this change in energy as I said above is what we call heat. So in summary heat isn't really something like a particle its just the transfer of energy from a hot thing to a colder thing.

blackbird3 said:
The same thing applies to kentic energy - when one particle causes another to move, is something literally being exchanged between them?
What is being exchanged when a billiards ball crashes into another?

do you mean momentum?

Thanks for all your replies! )

## 1. What is heat?

Heat is a form of energy that is transferred between objects or systems due to a temperature difference. It is a form of thermal energy that flows from a hotter object to a cooler object until both objects reach the same temperature.

## 2. What causes heat?

Heat is caused by the movement of particles, specifically the atoms and molecules that make up matter. When these particles move faster, they have more kinetic energy, which in turn leads to an increase in temperature and the production of heat.

## 3. What is kinetic energy?

Kinetic energy is the energy of motion. It is the energy that an object possesses due to its movement or velocity. The faster an object moves, the more kinetic energy it has. Kinetic energy is related to heat because the movement of particles that produces heat is a form of kinetic energy.

## 4. How is heat measured?

Heat is measured in units of energy, such as joules or calories. In scientific terms, heat is measured using the unit of energy known as the calorie, which is defined as the amount of heat needed to raise the temperature of one gram of water by one degree Celsius.

## 5. How does heat affect matter?

Heat can affect matter in several ways. It can cause objects to expand or contract, change states of matter (such as melting or boiling), and increase the speed of particles. In addition, heat can also cause chemical reactions to occur, which can alter the physical and chemical properties of matter.

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