5. A force Facts on a body and
displaces it by a distance 'S' in
a direction at an angle q with
the direction of force. (a) write
the expression for the work
done by the force. (b) what
should be the angle between
the force and displacement to
get (i) zero, (ii) maximum
work.
Answers
Answer:
Temperature is a physical quantity that expresses hot and cold. It is the manifestation of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy, when a body is in contact with another that is colder.
Temperature
Thermometer CF.svg
Two thermometers showing temperature in Celsius and Fahrenheit.
Common symbols
T
SI unit
K
Other units
°C, °F, °R, °Rø, °Ré, °N, °D, °L, °W
Intensive?
Yes
Derivations from
other quantities
{\displaystyle {\frac {pV}{nR}}}{\displaystyle {\frac {pV}{nR}}}, {\displaystyle {\frac {dq_{\text{rev}}}{dS}}}{\displaystyle {\frac {dq_{\text{rev}}}{dS}}}
Dimension
Θ
Thermal vibration of a segment of protein alpha helix: The amplitude of the vibrations increases with temperature.
Average daily variation in human body temperature
Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have used various reference points and thermometric substances for definition. The most common scales are the Celsius scale (formerly called centigrade, denoted °C), the Fahrenheit scale (denoted °F), and the Kelvin scale (denoted K), the last of which is predominantly used for scientific purposes by conventions of the International System of Units (SI).
The lowest theoretical temperature is absolute zero, at which no more thermal energy can be extracted from a body. Experimentally, it can only be approached very closely, but not reached, which is recognized in the third law of thermodynamics.
Temperature is important in all fields of natural science, including physics, chemistry, Earth science, astronomy, medicine, biology, ecology and geography as well as most aspects of daily life.