All Flashcards
What are the key differences between specific heat and thermal conductivity?
Specific Heat: How much energy is needed to change temperature. | Thermal Conductivity: How fast heat moves through a material.
Compare materials with high vs. low specific heat.
High Specific Heat: Requires a lot of energy to change temperature, heats up/cools down slowly. | Low Specific Heat: Requires little energy to change temperature, heats up/cools down quickly.
Compare materials with high vs. low thermal conductivity.
High Thermal Conductivity: Transfers heat very quickly. | Low Thermal Conductivity: Slows down heat transfer.
Differentiate between the units of specific heat and thermal conductivity.
Specific Heat: J/kg·°C | Thermal Conductivity: W/m·°C
What is the difference between heat and thermal energy?
Heat: The transfer of energy between objects due to a temperature difference. | Thermal Energy: The total kinetic and potential energy of the molecules within an object.
What happens when a material with high specific heat is heated?
Its temperature increases slowly because it requires a large amount of energy to raise its temperature.
What happens when a material with high thermal conductivity is placed in contact with a heat source?
Heat is rapidly transferred through the material.
What is the effect of increasing the thickness () of a material on the rate of heat transfer?
Increasing the thickness decreases the rate of heat transfer.
What happens if the temperature difference () across a material increases?
The rate of heat transfer through the material increases.
What is the effect of increasing the cross-sectional area () on the rate of heat transfer?
Increasing the cross-sectional area increases the rate of heat transfer.
What is specific heat ()?
The amount of energy needed to raise the temperature of 1 kg of a substance by 1°C.
What is thermal conductivity ()?
A measure of how well a material conducts heat.
Define heat energy transferred ().
The amount of energy transferred due to a temperature difference (measured in Joules).
Define rate of heat transfer ().
The amount of heat energy transferred per unit of time (measured in Watts).
What is in the context of specific heat and thermal conductivity?
Change in temperature, usually measured in degrees Celsius (°C).