Advertisements
Advertisements
प्रश्न
Why does a piece of ice when touched with hands appear cold?
Advertisements
उत्तर
We feel cold on touching ice because heat flows from our warm hands to cold ice. Due to this flow of heat from hand to ice, the temperature of our hand falls. This is why we feel cold.
APPEARS IN
संबंधित प्रश्न
Write down the body temperature of a healthy person.
What causes a change in the temperature of a body?
The hot metal ball is suspended from a string in a metal box as shown in the following figure
(i) What are the ways in which the ball loses heat
(ii) Which side of the box will be the hottest and which the least hot after some time? Explain.
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
Thermal energy always flows from a system at higher temperature to a system at lower temperature.
For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between 35°C to 40°C. At places, where room temperature remains much below the range, setting of curd becomes difficult. Suggest a way to set curd in such a situation.
The Kelvin is the basic unit of ______.
