Heat The motion of the particles of matter. Heat Transfer Heat flows from an area of high heat to an area low in heat. Heat flows from an area of high.

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Presentation transcript:

Heat The motion of the particles of matter

Heat Transfer Heat flows from an area of high heat to an area low in heat. Heat flows from an area of high heat to an area low in heat.

Three methods of heat transfer Conduction: Conduction: –Transfer from one substance to another by direct contact of molecules. Example: When you touch a hot stove. Convection: Convection: –Heat carried from one place to another in a liquid or gas as molecules move in currents caused by density differences. Example: Warm air rising. Radiation: Radiation: –Heat carried through empty space in the form of infrared rays. Example: When you face the sun and feel warmth on your face.

Temperature: A measure of the average kinetic energy of molecules. A measure of the average kinetic energy of molecules. The faster the molecules of a substance are moving, on average, the higher the temperature. The faster the molecules of a substance are moving, on average, the higher the temperature. Thermometer - An instrument for measuring temperature. Thermometer - An instrument for measuring temperature.

Temperature Scales: Celsius - Celsius - –Most common scale world wide - Used in all scientific measurements. –Freezing point of water is 0 o C. –Boiling point of water is 100 o C. Kelvin - Kelvin - –An "absolute" scale used for kinetic theory calculations. –Zero on this scale, 0 K, is the lowest possible temperature. –Note the way the temperature is written, 0 K. This is read as "zero kelvins", without using the word degrees. –To convert Celsius degrees to kelvins, add 273 to the Celsius temperature. Fahrenheit - Fahrenheit - –The temperature scale generally used in the United States. –Freezing point of water is 32 o F. –Boiling point of water is 212 o F. –While converting between o C and o F is not stressed in this class, a "ball park" conversion would be o C = ( o F - 30) / 2. While this gives a Celsius temperature that is a little low, it is a quick way to compare the two scales.

Absolute Zero - The lowest possible temperature. - The lowest possible temperature. The temperature would be 0 K or about o C. The temperature would be 0 K or about o C.

Calorie: The unit of heat. The unit of heat. The amount of heat needed to raise the temperature of one gram of water one degree Celsius. The amount of heat needed to raise the temperature of one gram of water one degree Celsius. A "Food Calorie" is 1000 calories, or a Kilocalorie A "Food Calorie" is 1000 calories, or a Kilocalorie

Specific Heat The ability of a substance to absorb heat. The ability of a substance to absorb heat. The specific heat of a substance is the number of calories needed to raise the temperature of one gram of the substance one Celsius degree. The specific heat of a substance is the number of calories needed to raise the temperature of one gram of the substance one Celsius degree. The units of Specific Heat are - calories per gram Celsius degree. The units of Specific Heat are - calories per gram Celsius degree.

EQUATION Heat gained or lost = (mass) (change in Temp) (specific heat) Heat gained or lost = (mass) (change in Temp) (specific heat) q = m x  T x C p