Thermodynamics Flashcards
Any and all substances can exist in 1 of these 4 states:
Solid
Liquid
Gas
Plasma
State of matter is determined by what 2 things?
Temperature
Pressure
Matter in a gaseous state has no definitive _____ or _____.
Size
Shape
The process when a substance changes from a solid to a vapor.
Sublimination
What are the 3 states of water?
Solid
Liquid
Gas
Some scientist say heat is _____ _____.
Molecular motion
Water in its natural state is in the liquid/solid form. By removing heat from a given quantity of water the molecules slow down/speed up and the cohesion and adhesion between the molecules decrease/increase pulling the molecules close together and increasing its density. If enough heat is removed, the water will reach its densest point at 39/49°F.
Liquid
Slow down
Increase
39°F
When heat is added to water at atmospheric pressure, the molecules will decrease/increase in speed.
Increase
What is used to identify heat quantity in the English measuring system?
British Thermal Unit (BTU)
The specific heat of any substance is the amount of heat required to lower/raise 1 lb of the substance 1°F at a given temperature and pressure.
Raise
A good conductor has a specific heat capacity of less than _____.
1.0
The ability of a substance could get so cold that it’s molecules would cease to move and it could get no colder because there is no lower temperature.
Absolute zero
What are the 3 ways heat transfer occurs?
Radiation
Conduction
Convection
What is the ability of a substance to conduct heat or the rate of conduction?
Thermal conductivity
If adding or removing heat causes a change in the temperature of a material, the heat is called what?
Sensible heat