Q.12.
Answer in one sentence:
What is an indication of the heat in a substance?
Ans.
2)
What is meant by transfer of heat?
ins.
5)
Why is it warm above a table lamp?
ns.
Answers
explanation:
1)
मराठी मध्ये शोधा
एक पदार्थ उष्णता संकेत काय आहे
Explanation: the number of units of heat required to raise the temperature of a unit mass of the substance at that temperature one degree. The specific heat of a substance is the amount of heat energy that has to be pumped into it to raise its temperature.
2)
मराठी मध्ये शोधा
व्हॉट इस मेत बी ट्रान्सफर ऑफ हीट
In general, heat transfer describes the flow of heat (thermal energy) due to temperature differences and the subsequent temperature distribution and changes. The study of transport phenomena concerns the exchange of momentum, energy, and mass in the form of conduction, convection, and radiation.
3)The feeling of heat on your skin is a relatively simple matter of comparing two temperatures - the temperature of upper skin, with the temperature of lower skin. If the upper skin is hotter, we feel warm, if it's colder, we feel cold. All objects emit IR light.