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Physics 211 lecture 30 Temperature Scale and Thermal Expansion

Temperature Scales. Absolute: Kelvin, RankineWhen molecules do not have enough energy to move at all, that is defined at T=0. Increments of temperature are based on an arbitrary temperature assignment at which some physics phenomenon occurs. Arbitrary or Fixed Reference: Fahrenheit, CelsiusTemperature values are assigned to two states at which particular physical phenomena occur. Increments of temperature are determined by the numbers assigned at the two points. ?.

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Physics 211 lecture 30 Temperature Scale and Thermal Expansion

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    1. Physics 211 – lecture 30 Temperature Scale and Thermal Expansion Temperature Temperature is a relative measure of the amount of energy stored in a system’s molecules, which is perceived as hotness or coldness of a substance. The more energetically molecules move, rotate, and vibrate, the hotter a substance will be.   Temperature is experienced relative to other objects, temperatures of two objects are equal if they are in thermal equilibrium. Units of temperature: Scale Symbol water freezes water boils scale type Fahrenheit ?F 32?F 212?F fixed reference Celsius ?C 0?C 100?C fixed reference Rankine R 459.67R 671.67R absolute Kelvin K 273.15K 373.15K absolute Temperature Conversion Equations:  

    2. Temperature Scales Absolute: Kelvin, Rankine When molecules do not have enough energy to move at all, that is defined at T=0. Increments of temperature are based on an arbitrary temperature assignment at which some physics phenomenon occurs. Arbitrary or Fixed Reference: Fahrenheit, Celsius Temperature values are assigned to two states at which particular physical phenomena occur. Increments of temperature are determined by the numbers assigned at the two points.  

    3. Thermal Expansion Different substances expand/contract different amounts when heated/cooled. Note: behavior of water is an exception between 0°C and 4°C. This is why ice floats.

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