Heat SAQ

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What is the unit of temperature?

Kelvin (K)

What is the relationship between temperature in Celsius and Kelvin?

t(°C) = T(K) - 273.15

What is the temperature in Kelvin at 0°C?

273.15K

What is heat and what is its unit?

The energy due to the movement of the molecules within the body Signup and view all the answers

What is an example of a thermometric property?

The expansion of the liquid in a mercury thermometer Signup and view all the answers

What is the physical quantity that the heat capacity of a body represents?

The amount of heat required to raise the temperature of the body by 1 K. Signup and view all the answers

What is the difference between heat capacity and specific heat capacity?

Heat capacity is the amount of heat required to raise the temperature of a body by 1 K, while specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1 K. Signup and view all the answers

What is the unit of specific heat capacity?

Joule per kilogram Kelvin (J kg⁻¹K⁻¹) Signup and view all the answers

What is the relationship between heat capacity, mass, and specific heat capacity, as expressed by the equation Q = mcΔθ?

The heat capacity of a body is the product of its mass and specific heat capacity, multiplied by the change in temperature. Signup and view all the answers

What is the physical significance of the change in temperature (Δθ) in the equations Q = CΔθ and Q = mcΔθ?

It represents the change in temperature of a body or substance, which is a measure of the heat energy absorbed or released. Signup and view all the answers

What is the main advantage of using bricks with high specific heat capacity in storage heaters?

They can store a considerable amount of heat energy without significant temperature rises. Signup and view all the answers

What is the difference between latent heat and specific latent heat?

Latent heat is the amount of heat required to change the state of a body without a change in temperature, whereas specific latent heat is the amount of heat required to change the state of 1 kg of a substance without a change in temperature. Signup and view all the answers

What is the specific latent heat of fusion, and what is its unit?

It is the amount of heat required to change 1 kg of a substance from a solid to a liquid without a change in temperature, and its unit is J Kg⁻¹. Signup and view all the answers

What is an example of a change of state of a substance, and what happens to the temperature during this process?

An example is water evaporating into steam, and during this process, the temperature remains constant. Signup and view all the answers

How is the specific latent heat of a substance related to the amount of heat required to change its state?

The specific latent heat is the amount of heat required to change the state of 1 kg of the substance. Signup and view all the answers

What is the significance of the specific latent heat of vaporisation in a substance?

It is the amount of heat required to change 1 kg of the substance from a liquid to a gas without a change in temperature. Signup and view all the answers

How does the specific heat capacity of a brick affect its ability to store heat energy?

A brick with high specific heat capacity can store a considerable amount of heat energy without significant temperature rises. Signup and view all the answers

What is the equation that relates the energy supplied or withdrawn to the mass of a body and its specific latent heat?

Q = ml Signup and view all the answers

What is the primary difference between conduction and convection as methods of heat transfer?

Conduction involves the transfer of heat through direct molecular contact, whereas convection involves the transfer of heat through the movement of fluids. Signup and view all the answers

How does solar radiation transfer heat from the Sun to the Earth?

Solar radiation transfers heat from the Sun to the Earth through electromagnetic waves. Signup and view all the answers

What is the significance of a low U-value in a structure?

A low U-value indicates that a structure is a good insulator, meaning it reduces heat transfer. Signup and view all the answers

What is the primary mechanism of heat transfer in a heat pump, such as a refrigerator?

The primary mechanism of heat transfer in a heat pump is conduction, followed by convection. Signup and view all the answers

What is the role of perspiration in heat transfer in the human body?

Perspiration cools the body through the process of evaporation, which is a form of heat transfer by convection. Signup and view all the answers