Use And Understand The Principles Of Heat Dynamics 2 Flashcards
What is the basic unit of heat in the Metric system?
Calorie
How much heat energy is in a small calorie?
The amount of heat that will raise the temperature of 1 gram of water 1 C
How much heat energy is in a large calorie?
The amount of heat energy that will raise the temperature of 1 kilogram of water 1 C
What is the first law of thermodynamics?
Heat energy can neither be created nor destroyed, it can only be changed in its form
What is the second law of thermodynamics?
Heat energy can only flow from hot to cold
What is an example of heat transfer by conduction?
Removal of heat from an engine cylinder by air flowing over its surface
What is an example of heat transfer by convection?
The uniform heating of the air in a room by a floor heater. The heated air rises and forces the cooler air down so it can be heated by conduction.
What is an example of heat transfer by radiation?
The heating of the Earths surface by heat transmitted through space from the sun
Why do most metals expand when they are heated?
As heat is absorbed, the electrons move faster and expand their orbits in the molecules of the metal
