Explain the saying “It’s not the heat; it’s the humidity.”

Q: Why will wrapping a bottle in a wet cloth at a picnic often produce a cooler bottle than placing the…

A: When a bottle is kept in a bucket of cold water, the bottle is being cooled by the process called…

Q: what is meant by optimal temperature ?

A: Optimum temperature: The temperature at which an enzyme shows its highest activity is called optimum…

Q: In which mode of heat transfer is the convection heat transfer coefficient usually higher, natural…

A: In forced convection the the convective heat transfer coefficient is higher.

Q: Cite three ways in which a Thermos bottle inhibits heat transfer.

A: Construction of thermos is as shown in the figure. Coffee is stored in an internal container as…

Q: why heat is called energy in transit?

A: Heat is a form of energy. It is defined as the process of transfer of energy from a higher…

Q: Why does snow often remain even when daytime temperatures are higherthan the freezing temperature?

A: For any substance to melt, it requires an enormous amount of energy. Snow forms by the fusion of…

Q: On a chilly 10°C day, your friend who loves cold weather says she wishes it were twice as cold.…

A: Here, 10°C in Kelvin = 10+273 = 283 K         -131.5°C in Kelvin = -131.5+273 = 141.5 K

Q: Why is evaporation a cooling process?

A: Evaporation is the process in which water changes its phase from liquid to gaseous.

Q: On average, would Earth be warmer or cooler without the atmosphere? Explain your answer.

A: The water and the carbon dioxide molecules in the atmosphere absorb light ray and radiates back into…

Q: Which has the greater amount of internal energy- an iceberg or a cup of hot coffee? Defend your…

A: The internal energy is the sum of all energy within the substance.

Q: The Earth is not in thermal equilibrium with sun, Why?

A: The temperature of the sun and that of earth aren’t the same. Sun is at a very high temperature and…

Q: What is calorimeter?

A: Chemical reactions in general involve an exchange of heat between the system (reactants and…

Q: What heats faster, land or water?

A:

Q: Why does the high specific heat of water have to do with convection currents in the air at the…

A: Water has a high specific heat capacity (of 4200 J/Kg°C) on the seashore and the land has a much…

Q: Why should we wear cotton clothes in summer?

A: We sweat more in the summer session. Cotton is a strong water absorber helps to absorb the sweat and…

Q: Why do woolen blankets keep us warm better than cotton sheets?

A: In the woolen blanket, there are more gaps. So, more air are confined within woolen blanket. Air is…

Q: What is a thermocouple?

A:

Q: Iceland, so named to discourage conquest by expanding empires, is not at all ice covered like…

A: The average temperature is just not only depends on the latitude of a certain place it also depends…

Q: In summer cotton dresses should be preferred, Why?

A: Step 1During summers everyone tends to perspire a lot as a mechanism of our body to keep us cool.…

Q: What makes heat transfer by radiation different from conduction and convection?

A:

Q: Everybody knows that warm air rises. So it might seem that the air temperature should be higher at…

A: When air will get warmer, it will rises and expands. As air is expanding, the pressure will be…

Q: How does the frequency of radiant energy relate to the absolute temperature of the radiating source?

A: The frequency of the radiant energy is directly proportional to the absolute temperature of the…

Q: What generally happens to the temperature of rising air and sinking air?

A: If the Air sinking down compresses air at the surface, raising temperatures near the ground. The…

Q: Since all objects emit energy to their surroundings, why don’t the temperatures of all objects…

A: The method of heat transfer which doesn't require any medium is radiation. In radiation, heat is…

Q: Cooling is produced when a gas at high pressure suddenly expands. Explain.

A: When the gas at high pressure suddenly expands, the average distance between its molecules…

Q: Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.

A: Specific heat capacity is the amount of heat energy takes to raise or lower the temperature of one…

Q: Name the method of heat transfer which doesnot depend on gravity.

A: In radiation, heat is transferred without any motion of the medium particles

Q: Why heat is called the disordered energy?

A: As the heat energy of a system increases, its entropy will increase. Entropy is a measure of…

Q: Why does the weather become very cold after a hail storm?

A: Ice absorbs a large amount of Latent heat from the surroundings to melt. There is a lot of heat in…

Q: What type of heat transfer helps the balloon rise?

A: To determine the mode of heat transfer that helps the balloon to rise.

Q: The earth without its atmosphere would be inhospitably cold , Why?

A: The sun rays contain infrared radiations.When these rays reach earth’s surface, these are reflected…

Q: What is first law of thermo dynamics?

A: First law of thermodynamics is based on principle of energy conservation. i.e. whenever you add some…

Q: If you wish to save fuel and you’re going to leave your warm house for a half hour or so on a very…

A: Answer : Turn it off altogether

Q: Which will undergo the greater rate of cooling- a red hot poker in warm oven or red hot poker in…

A: According to Newton’s law of cooling, rate of cooling is directly proportional to the temperature…

Q: If water had a lower specific heat capacity, would ponds be more likely to freeze or less likely to…

A: A lower heat capacity means that less energy must be transferred to result in a temperature change.

Q: How does the science of heat transfer differ from the science of thermo dynamics?

A: The thermodynamics is the framework of science which deals with the system’s energy interaction…

Q: Why is sweating an efficient mechanism for cooling off on a hot day?

A: There will be evaporation of water and other liquids present on human’s skin into the air. The…

Q: Which of the following is not an example of heat transfer via convection? Air Conditioner O Breeze O…

A: Correct option  (D). Microwave oven Reason 1) Microwave is example of radiation. 2) Microwaves use…

Q: What is quality? Does it have any meaning in the superheated vapor region?

A: The ratio of the mass of the vapor to the total mass of the mixture is known as quality. It is also…

Q: If you were caught in freezing weather with only your own body heat as a source, would you be warmer…

A: In a freezing weather, only source of heat available is body temperature.

Q: The temperature which matters in the data-centers for keeping them cool, is known as  Wet-bulb…

A:

Q: Give examples of latent heat, fusion, evaporation, and condensation on a day to day basis.

A: Objective: To determine the examples of latent heat, fusion, evaporation, and condensation in the…