# Shared Flashcard Set

## Details

Energy and Temperature
Here are some main ideas you should consider when studying.
20
Physics
10/20/2011

Term
 What is 212 degrees Fahrenheit equal to in Celsius?
Definition
 100 degrees Celsius.
Term
 What is 0 degrees Celsius equal to in Fahrenheit?
Definition
 It is equal to 32 degrees Fahrenheit.
Term
 What is temperature?
Definition
 The measure of kinetic energy of an object.
Term
 How does a thermometer work?
Definition
 As the alchohol in the thermometer's kinetic energy increases (tempature increases), it expands, moving upward.
Term
 How does a thermostat depend on two different metals? How does this work?
Definition
 As the tempature rises it causes one of the metals to expand faster than the other causing the coil to turn one way or the other.
Term
 What is absolute 0?
Definition
 When an object has a kinetic energy of 0.-273 degrees celsius is absolute 0 of Kelvins.
Term
 Describe the relationship between temperature and energy.
Definition
 The higher the temperature the more energy an object has.
Term
 With heat, in what direction does energy get transferred?
Definition
 If goes from the hotter object to the cooler object. (tryin to reach an equilibrium)
Term
 What is conduction?
Definition
 When energy is transferred through direct touch.
Term
 What is convection?
Definition
 Convection is the transfer of energy through the air.
Term
Definition
 The transfer of energy through electromagnetic rays.
Term
 What properties make something a good conducter or a insulater?
Definition
 A good conducter: Dense A good insulater: Lots of space between it's particles (not dense)
Term
 What is specific heat?
Definition
 Specific heat is the amount of energy it takes ot heat a kg of a substance one degree.
Term
 What is the specific heat of water?
Definition
 4,186
Term
 As energy is added to water, what is happening during the times that tempature doesn't change?
Definition
 Either it raises it's tempature or changes it's state; but not both at the same time. If the tempature isn't going up, it's changing state.
Term
 What is the first law of thermodynamics?
Definition
 The total energy in any process is conserved; whether that energy is transferred as a result of work, heat or both.
Term
 Describe the concept of entropy.
Definition
 The measure of disorder in any system. The concept is that ll energy spreads out, even though it still exists, you can never get it back as usable energy.
Term
 Why does usable energy decrease in all energy transfers?
Definition
 Because during the process of transferring energy, som of it is lost to entropy.
Term
 Describe each "stroke" of a four stroke engine.
Definition
 1. Intake Suck in air and fuel2. CompressionCompress the air and fuel3. PowerAir and gas is ignited and pushed the piston downward4. Exhaust Piston moves up again and pushes waste gases up and out.
Term
 His is an internal combustion engine a contributer to entropy?
Definition
 When the engine pistons push upward and release the air in the exhaust stroke, it is released to entropy. Most of the energy is lost as heat.
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