# Shared Flashcard Set

## Details

Physics terms-heat
Preeceville
19
Physics
10/23/2008

Term
 Absolute zero
Definition
 The theoretical lowest temperature possible, which occurs when all random motion of molecules has ceased
Term
 Boiling point
Definition
 The temperature at which a phase change of liquid to gas takes place through boiling. It is the same temperature as the condensation point
Term
 Celsius scale of temperature
Definition
 In the celsius scale of temperature, the ice-point is taken as taken as the lower fixed point (0 deg C ) and the steam-point is taken as the upper fixed point (100 deg C). The interval between the ice point and steam point is divided into 100 equal divisions. Thus, the unit division on this scale is 1degC. This scale was earlier called the centigrade scale. 1 deg C = 9/5 deg F.
Term
Definition
 Alternate name for the Celsius scale
Term
 Coefficient of volume expansion
Definition
 The increase in volume of a substance per unit original volume per degree rise in temperature is called its coefficient of cubical expansion. The SI unit of coefficient of cubical expansion is K-1.
Term
 Coefficient of linear expansion
Definition
 The increase in length per unit original length per degree rise in temperature is called the coefficient of linear expansion. The SI unit of the coefficient of linear expansion is K-1.
Term
 Conduction
Definition
 The transfer of heat from a region of higher temperature to a region of lower temperature by increased kinetic energy moving from molecule to molecule
Term
 [image]
Definition
 Heat of FusionThe energy required to change a gram of a substance from the solid to the liquid state without changing its temperature is commonly called it's "heat of fusion". This energy breaks down the solid bonds, but leaves a significant amount of energy associated with the intermolecular forces of the liquid state.
Term
 [image]
Definition
 Heat of Vapourization The energy required to change a gram of a liquid into the gaseous state at the boiling point is called the "heat of vaporization". This energy breaks down the intermolecular attractive forces, and also must provide the energy necessary to expand the gas (the PDV work). For an ideal gas , there is no longer any potential energy associated with intermolecular forces. So the internal energy is entirely in the molecular kinetic energy. The final energy is depicted here as being in translational kinetic energy, which is not strictly true. There is also some vibrational and rotational energy.
Term
Definition
 The transfer of heat from a region of higher temperature to a region of lower temperature by greater emission of radiant energy from the region of higher temperature
Term
 Convection
Definition
 Transfer of heat from a region of higher temperature to a region of lower temperature by the displacement of high-energy molecules-for example, the displacement of warmer, less dense air (higher kinetic energy) by cooler, denser air (lower kinetic energy)
Term
 Heat
Definition
 Heat is a form of energy, which makes a body hot or cold. Heat is measured by the temperature-effect it produces in any material body. The SI unit of heat is Joule( J).
Term
 kinetic energy
Definition
 - energy in motion. Kinetic energy is the greatest in gases and least in solids.
Term
 potential energy
Definition
 - stored energy. Potential energy is the greatest in solids and least in gases.
Term
 specific heat capacity
Definition
 - the quantity of heat (energy) needed to raise the temperature of unit of mass of a substance by a unit of temperature change.
Term
 The First Law of Thermodynamics
Definition
 (a restatement of the Law of Conservation of Energy) states:The quantity of heat energy transferred to a system is equal to the work done by the system plus the change in the internal energy of the system You can't Win
Term
 Second Law of Thermodynamics.
Definition
 Natural Processes go in a direction that increases the ENTROPY of the systemThe natural flow of heat is from a hot object to a cold object.Another way of saying the 2nd law is that energy, when converted from one form to another, can only be lost and not gained.You Can't Loose
Term
 The Third Law of Thermodynamics
Definition
 states:Therman Energy is conserved within a closed system.Absolute zero can never be reached.You can't get out of the Game
Term
 Entropy
Definition
 everything moves toeards becoming More disorganized(to chaos)
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