* Temperature and Kinetic Energy: Temperature is a measure of the average kinetic energy of the particles in a substance. Kinetic energy is the energy of motion. So, a higher temperature means the particles are moving faster on average.
* Heat Transfer: When heat is added to a substance, the energy is transferred to the particles, causing them to move faster. This increased motion is what we perceive as a hotter object.
* Molecular Vibration: The particles in a solid or liquid are constantly vibrating. When heat is added, the vibrations become more vigorous, increasing the speed at which the particles move around.
* Gas Particles: In a gas, the particles are already moving much more freely. When heated, they move faster and collide more frequently, resulting in increased pressure.
Think of it like this: Imagine a group of people standing still. They represent the particles in a cold object. Now, imagine them starting to dance and move around. This is like adding heat – the particles are now moving faster and have more energy.
