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 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).
What is in the context of heat transfer?
Change in temperature, usually measured in degrees Celsius (°C).
Define cross-sectional area () in the context of thermal conductivity.
The area perpendicular to the direction of heat flow (measured in square meters, m²).
What is the effect of high specific heat on temperature change?
High specific heat causes a smaller temperature change for a given amount of heat transfer.
What is the effect of high thermal conductivity on heat transfer rate?
High thermal conductivity results in a faster rate of heat transfer.
What happens when heat is added to a substance with high specific heat?
The substance's temperature increases slowly.
What happens when a material with high thermal conductivity is placed between two objects of different temperatures?
Heat is rapidly transferred from the hotter object to the colder object.
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.