Heat and Heat Transfer

M1.13

Define temperature.

translational kinetic energy of the atoms in a system

What are the conditions to attain thermal equilibrium?

heat absorbed = heat released

Define specific heat capacity.

heat required to change the temperature of 1 kg of a substance by 1K/1C

A 20 ^oC water of mass 0.50kg is cooled to become an ice block at 0 ^oC. What is the amount of heat involved?

-207000 J

Heat is added to 0.500 kg of water at room temperature (20 ^oC). How much heat in joules is required to change the water to steam at 100 ^oC?

+1.3 × 10⁶ J

What is the difference between the latent heat of vapourisation and fusion?

latent heat of fusion is the phase transition at constant temperature from solid to liquid

latent heat of vapourisation is the phase transition at constant temperature from liquid to solid

How is heat transferred through conduction?

molecules at a higher temperature vibrate faster, collide and transfer more energy to a region with lower temperature, physical contact is needed

A piece of 0.50 kg ice at 0 ^oC is dropped into a 1.0 kg of 100 ^oC water. When thermal equilibrium is reached, all that is left is water. Determine the thermal equilibrium temperature.

40^o

How is heat transferred through convection?

cooler water sink and warmer water rise to the top as they are less dense

How is heat transferred through radiation?

heat transferred by electromagnetic waves without medium for their propagation