Advertisements
Advertisements
प्रश्न
Give a scientific reason for the following:
In winter the birds fluff up their feathers.
उत्तर
In winter the birds fluff their feathers in order to trap air in their feathers so that the air provides heat insulation to their body from the surroundings and keeps them warm and saves them from winter.
APPEARS IN
संबंधित प्रश्न
What is the Celsius scale of temperature ?
Name the S.I. unit of heat and how is it related to the unit calorie?
Express Kelvin Zero in °C
Distinguish between heat and temperature.
Is it possible to heat a liquid or gas from above? Explain your answer.
State the advantages and disadvantages of mercury and alcohol as thermometric liquids.
The following figure shows a copper washer. Explain, giving reasons, whether the following characteristics of the washer increase, decrease, or remain the same when it is heated.
(a) Internal diameter
(b) Volume
(c) Mass
(d) Density
(e) External diameter
What do you understand by thermal equilibrium?
Suppose your normal body temperature were lower than what it is. How would the sensation of hot and cold change?
