Heat and Thermal Energy 2023

Front

What is conduction?

Back

Conduction is the transfer of thermal energy through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one through the collision of particles.

Front

What is convection?

Back

Convection is the transfer of thermal energy in fluids (liquids and gases) through the movement of the fluid itself. Hotter, less dense fluid rises while cooler, denser fluid sinks, creating a circulation pattern.

Front

What is radiation?

Back

Radiation is the transfer of thermal energy through electromagnetic waves. It does not require a medium to travel, allowing heat to be transferred through empty space.

Front

What is heat?

Back

Heat is the energy transferred between objects due to a temperature difference. It flows from warmer objects to cooler ones until thermal equilibrium is reached.

Front

What is temperature?

Back

Temperature is a measure of the average kinetic energy of the particles in a substance. It indicates how hot or cold an object is.

Front

What happens to the kinetic energy of particles as temperature increases?

Back

As temperature increases, the average kinetic energy of the particles in a substance also increases, causing them to move faster.

Front

What is thermal equilibrium?

Back

Thermal equilibrium is the state in which two objects in contact with each other reach the same temperature, resulting in no net heat transfer between them.

Front

How does a hot air balloon rise?

Back

A hot air balloon rises because the air inside the balloon is heated, becoming less dense than the cooler air outside. This difference in density creates an upward buoyant force.

Front

What is the role of a conductor?

Back

A conductor is a material that allows heat to pass through it easily. Metals like copper and aluminum are good conductors.

Front

What is an insulator?

Back

An insulator is a material that resists the flow of heat. Examples include wood, plastic, and rubber.