Flashcards
Physics - Heat Flashcards
Flashcards do conjunto (22)
- 1Temperaturetemperature is the measure of the hotness or coldness of a body
- 2Unit of temperatureSi unit : Kelvin (K)
- 3Relationship between degrees celsius and kelvins0 degrees celsius = 273.15 kelvins
- 4Thermometric Propertyany physical property that changes measurably with temperature.
- 5Examples of thermometric properties:· length of a column of liquid
· electrical resistance
· emf of a thermocouple
· colour of certain crystals
· volume of a gas at constant pressure
· pressure of a gas at constant volume - 6Heat Capacityheat capcity of an object is the heat energy needed to change it`s temperature by 1K (1`C)
- 7Specific Heat Capacityof a substance is the amount of heat energy needed to change the temperature of 1kg of a substance by one kelvin
- 8Unit of Specific Heat Capcityjoule per kilogram per kelvin ( J/kg/K )
- 9Specific Heat Capacity of Water4180 J/kg/K
- 10Specific Heat Capacity of Copper390 J/kg/K
- 11Latent Heat (L)of a substance is the heat energy needed to change its state without change in temperature
- 12Unit of Latent Heatjoule (J)
- 13Specific Latent Heat (l)of a substance is the amount of heat energy needed to change the state of 1kg of a sustance without a change in temperature
- 14Unit of Specific Latent Heatjoule per kilogram (J/kg)
- 15Specific Latent Heat of Vaporisatiomof a sustance is the amount of heat enrgy needed to change 1kg of that substance from a liquid to a gas without a change in temperature (i.e. at its boiling point)
- 16Specific Latent Heat of Fusionof a substance is the amount of heat energy needed to change 1kg of a substance from a solid to a liquid without a change in temperature (i.e. at its melting point)
- 17Forms of Heat Transfer· Conduction
· Radiation
· Convection - 18Convectionis the transfer of heat through fluid by means of ciculating currents of fluid caused by heat
- 19Radiationis the transfer of heat energy from one place to another in the form of electromagnetic waves
- 20Conductionis the movement of heat energy through a substance by the passing on of molecular vibration from one molecule to molecule. There is no overall motion of the substance
- 21U-Valueof a structure is the amount of heat energyconducted per second through one metre squared of that structure with a tempersture difference of 1K/C is maintained between its ends
- 22Solar Constant (Solar Irradiance)is the average amount of the sun's energy falling per second perpendicularly on 1 metre of the earth's atmosphere. it's value is about 1.35 kW/m squared
Informações
- Descrição
- All the definitions on the Heat chapters in the leving cert syllabus.
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- patriciadj
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