Prepared by:
LAURO A. CALIVA
Thermal Expansion
• THERMAL EXPANSION refers to the spreading out of particles in a substance as the thermal energy increases.
• Almost all materials take up more space when heated (expansion) and less a space when cooled (contraction).
Thermal Expansion
• Some things expand more than others when heated.
• One practical application of thermal expansion is the bimetallic strip in thermostat.
Prepared by:
LAURO A. CALIVA
Thermal Expansion
• HEAT TRANSFER refers to HEAT FLOW WITHIN AN OBJECT AND FROM ONE OBJECT TO ANOTHER due to differences in temperature.
• Transmission of heat to equalize the temperatures is brought about in three ways.
Thermal Expansion
• RADIATION - heat energy travels as electromagnetic waves in the same manner and speed as light.
Thermal Expansion
• CONDUCTION - heat energy travels when two objects at different temperatures are in direct contact with each other.
Thermal Expansion
• CONVECTION - the heat in fluids is transferred to cooler regions by currents.
Specific Heat
• SPECIFIC HEAT – the amount of energy required to raise the temperature of one kilogram of a substance by 1 K.
• HEAT CAPACITY – the amount of heat required to raise a substance’s temperature by one degree.