Energy

Test on Heat Transfer
Marks: 25 beat 45 Minutes



Describe an experiment to distinguish between proficient conductors and insulators.[5]
What is the purpose of the vacuum in a vacuum flask that is used to store a cold liquid?[2]
wherefore is it more effective to wear few layers of thin clothes than single thick layer clothing on a cold day? [3]
State the mechanism of heat lurch in fluids.[4]
Comp are between transfer of heat by conduction, convection and radiation.[5]
Explain how energy is trapped in a kelvin house.[3]
Explain how evaporation causes cooling?[3]













Heat

Heat is a do work of energy. It is the transfer of internal energy from one body to another(prenominal) as a result of temperature difference. Unit of heat is Joule.

Temperature
Temperature is a relative footstep of hotness or coldness. It is a measure of the average kinetic energy of the molecules of a depicted object. The molecules of all substance (solid, liquid, gas) are in inquiry. They always oscillate back and away about their equilibrium positions. The greater the temperature of a substance, the greater the motion of its molecules will be. SI unit of Temp is Kelvin (K).

cadence of Temperature
The system international unit of temperature is K (Kelvin).



other scales are 0C(degree celsius/centigrade) 0F (degree Fahrenheit). The freezing temperature of pure water is considered as 00C and steam mind is 100 0C.

Relation among different temperature scales is as below:

C/5 = (F-32)/9 = (K-273)/5…………………………….. (1)
Tk = Tc + 273……………………………….. (2)

The normal temperature of gentlemans gentleman body is 370C
i.e. 98.60F. The clinical thermometers are scaled from 94 0F to 108 0F . It is truly dangerous for a man to rise up his/her temperature surface to 1080F.





Effects of Heat on Matter

a)The body gets hotter- there is an sum up in temperature
b)There is an increase in size- expansion
c)There is a change of state from solid to...If you want to get a full essay, order it on our website: Ordercustompaper.com



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