1938557
Description
Flashcards by patriciadj, updated more than 1 year ago
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Created by patriciadj
about 9 years ago
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| Question | Answer |
| Temperature | temperature is the measure of the hotness or coldness of a body |
| Unit of temperature | Si unit : Kelvin (K) |
| Relationship between degrees celsius and kelvins | 0 degrees celsius = 273.15 kelvins |
| Thermometric Property | any physical property that changes measurably with temperature. |
| Examples 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 |
| Heat Capacity | heat capcity of an object is the heat energy needed to change it`s temperature by 1K (1`C) |
| Specific Heat Capacity | of a substance is the amount of heat energy needed to change the temperature of 1kg of a substance by one kelvin |
| Unit of Specific Heat Capcity | joule per kilogram per kelvin ( J/kg/K ) |
| Specific Heat Capacity of Water | 4180 J/kg/K |
| Specific Heat Capacity of Copper | 390 J/kg/K |
| Latent Heat (L) | of a substance is the heat energy needed to change its state without change in temperature |
| Unit of Latent Heat | joule (J) |
| Specific 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 |
| Unit of Specific Latent Heat | joule per kilogram (J/kg) |
| Specific Latent Heat of Vaporisatiom | of 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) |
| Specific Latent Heat of Fusion | of 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) |
| Forms of Heat Transfer | · Conduction · Radiation · Convection |
| Convection | is the transfer of heat through fluid by means of ciculating currents of fluid caused by heat |
| Radiation | is the transfer of heat energy from one place to another in the form of electromagnetic waves |
| Conduction | is 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 |
| U-Value | of 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 |
| Solar 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 |
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