Physics Chapter 9 (Thermal Properties And Temperature)

Define the term “Thermal Expansion”.

The expansion of volume when solid, liquid and gases are heated.

Why do railway lines and bridges have gaps?

To allow for expansion during a hot day.

Define the term “Internal Energy”.

Total energy of all particles.

Define the term “Specific heat capacity”.

The amount of energy required to raise the temperature by 1°C of 1kg unit mass.

Formula for “Specific heat capacity”.

C = ΔE​/mΔθ.

Unit for “Specific heat capacity”.

J/kg°C.

Define the term “Low specific heat capacity”.

Object needs a small amount of energy to raise the temperature by 1°C.

Define the term “High specific heat capacity”.

Object needs a greater amount of energy to raise the temperature by 1°C.

Factors that affect the increase in temperature of an object.

The mass and material of an object.

A pan has a specific heat capacity of 900J/kg°C, and a cooking pot has its specific heat capacity at 450J/kg°C. Which will heat up slower and why?

The pan, this is because it has a higher specific heat capacity than the cooking pot, so more energy is required to raise the temperature by 1°C.

Define the term “Evaporation”.

Molecules that have enough energy to overcome the attractive forces and escape into the atmosphere. The less energetic molecules are then left behind and therefore the average temperature of the liquid decreases.

Factors that affect the rate of evaporation.

Temperature.

Surface Area.

Movement Of Air.