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### 48 Cards in this Set

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 the actual air pressure given by the gauge reading plus the normal atmospheric pressure Absolute Pressure Any object placed in a fluid apparently loses weight equal to the weight of the displaced fluid Archimedes Principle the pressure caused by the weight of the air in the atmosphere Atmospheric Pressure For the horizontal flow of a fluid through a tube, the sum of the pressure and energy of motion(kinetic energy) per unit volume of the fluid is constant Bernoullis Principle The upward force exerted on a submerged or partially submerged object Buoyant Force The volume of fluid flowing past a given point in a pipe per unit time Flow Rate The amount of air pressure excluding the normal atmospheric pressure Gauge Pressure The pressure applied to a confined liquid is transmitted without measurable loss throughout the entire liquid to all inner surfaces of the container Hydraulic Principle (Pascals Principle) The pressure a liquid at rest exerts on a submerged object Hydrostatic Pressure The force applied per unit area Pressure The smooth flow of a fluid through a tube Streamline Flow The erratic, unpredictable flow of a fluid resulting from excessive speed of the flow or sudden changes in direction or size of the tube Turbulent Flow The lowest possible temperature Absolute Zero The amount of heat(energy) necessary to raise the temperature of 1lb of water 1°F BTU (british thermal unit) The amount of heat necessary to raise the temperature of 1g of water 1°C Calorie The metric temperature scale on which ice melts at 0° and water boils at 100° Celsius Scale A change in a substance from one form of matter to another Change of Phase A constant that indicates the amount by which a solid expands or contracts when its temperature is changed 1 degree Coefficient of Linear Expansion The change of phase from gas or vapor to a liquid Condensation A form of heat transfer from a warmer part of a substance to a cooler part as a result of molecular collisions, which cause the slower-moving molecules to move faster Conduction A form of heat tranfer by the movement of warm molecules from one region of a gas or a liquid to another Convection The temperature at which air becomes saturated with water vapor and condensation occurs Dew point The process by which high-energy molecules of a liquid continually leave its surface Evaporation The U.S. temperature scale on which ice melts at 32° and water boils at 212° Farenheit Scale The change of phase from liquid to solid. Also called solidification. Freezing The change of phase from solid to liquid. Also called melting. Fusion A form of internal kinetic and potential energy contained in an object associated with the motion of its atoms or molecules and which may be transferred from an object at a higher temperature to one at a lower temperature Heat The heat required to melt 1 g or 1 kg or 1 lb of a liquid Heat of Fusion The amount of heat required to vaporize 1 g or 1 kgor 1 lb of a liquid Heat of Vaporization A pump containing a vapor(refrigerant) that is easily condensed to a liquid when under pressure. produces heat during compression and cooling during vaporization. Heat pump The metric absolute temperature scale on which absolute zero is 0 K and the units are the same as on the Celsius Scale Kelvin Scale The amount of heat necessary to raise the temperature of 1 kg of water 1°C Kilocalorie The relationship between heat and mechanical work Mechanical Equivalent of Heat The change of phase from solid to liquid. Also called fusion. Melting When two substances at different temperatures are "mixed together", heat flows from the warmer body to the cooler body until they reach the same temperature. Part of the heat lost by the warmer body is transferred to the cooler body and to surrounding objects. If the two substances are well insulated from surrounding objects, the heat lost by the warmer body is equal to the heat gained by the cooler body. Method of Mixtures A form of heat transfer through energy being radiated or transmitted in the form of rays, waves, or particles Radiation The U.S. absolute temperature scale on which absolute zero is 0°R and the degree units are the same as on the Farenheit scale Rankine Scale Ratio of the actual amount of vapor in the atmosphere to the amount of vapor required to reach 100% of saturation at the existing temperature Relative humidity The change of phase from liquid to solid. Also called freezing. Solidification The amount of heat necessary to change the temperature of 1kg of a substance by 1°C in the metric system or 1lb of a substance by 1°F in the U.S. system Specific Heat A measure of the hotness or coldness of an object Temperature The ability of a material to transfer heat by conduction Thermal Conductivity The change of phase from liquid to a gas or vapor Vaporization A measure of a liquid's ability to vaporize. The more volatile the liquid, the greater is its rate of evaporation Volatility If the temperature of a gas is constant, the volume is inversely proportional to the absolute pressure, V/V'=P'/P Boyle's Law If the pressure on a gas is constant, the volume is directly proportional to its Kelvin or Rankine temperature, V/T = V'/T' Charle's Law A commonly used reference in gas laws, Standard temperature is the freezing point of water. Standard pressure is equivalent to atmospheric pressure Standard Temperature and Pressure (STP) D/D' = P/P' or DP' = D'P Boyle's Law