Mada za sehemu hiiThermal ExpansionMada 4
Heat – Is the transfer of energy due to temperature differences.
Temperature – Is the degree of hotness or coldness of a body.
OR
Heat is a form of energy, which raises the temperature of the substance.
SI Unit of Temperature is Kelvin (K). Conversion of centigrade into Fahrenheit given by:
Conversion of Fahrenheit into centigrade given by . Thermometer used for measurement of temperature. Maximum thermometer is the one, which is used to measure the highest temperature obviously filled with mercury.
A Minimum thermometer is used to measure the lowest temperature and it is filled with alcohol. Combined maximum and minimum thermometer (Six's thermometer) is used to measure highest and lowest temperature at the same time.
SI Unit of Heat is Joule (J)
M = Mass of substance
C = Specific heat capacity
= Final Temperature
= Initial Temperature
There are numerous sources of energy such as
- The sun, fuels,
- Nuclear sources,
- Geothermal,
- Electricity
The most important source of thermal energy is the sun. The sun generates its energy by a process called thermonuclear fusion. Most sources of thermal energy derive their energy from the sun. Thermal energy from the sun makes life on earth possible.
| Heat | Temperature |
|---|---|
| Heat is a form of energy that can transfer from hot body to cold body. | Temperature is the degree of hotness and coldness of a body. |
| Heat is the total kinetic energy and potential energy obtained by molecules in an object. | Temperature is the average K.E of molecules in a substance. |
| Heat flows from hot body to cold body. | It rises when heated and falls down when an object is cooled down. |
| It has a working ability. | It does not have the working ability. |
| Its SI unit is "Joule". | Its SI unit is "Kelvin". |
| It is measured by the calorimeter. | It is measured by the thermometer. |
| It is represented by "Q". | It is represented by "T". |
Mwalimu
Unasoma somo hili? Niulize nikuelezee chochote kilichomo.
Ingia ili kumuuliza Mwalimu wa AI wa Sonza kuhusu mada hii.
Ingia ili kuuliza