Heat Transfer

Important Questions

Question 1: Compare and contrast boiling and evaporation.

• Evaporation:-

1) Evaporation is the process of conversion of a liquid into vapours at any temperature below its boiling point.

2) In the process of evaporation, bubbles are not formed.

3) It is slower than the process of boiling (Slow process).

4) It occurs at all/any temperature.

5) In the process of evaporation, temperature may change.

6) Energy supplied by the surroundings.

• Boiling:-

1) Boiling is the process by which a liquid turns into a vapor when it is heated to its boiling point.

2) In the process of boiling, bubbles are formed.

3) It is faster than the process of evaporation (Quick process).

4) It occurs at a definite/fixed temperature (boiling point).

5) In the process of boiling, temperature remains constant.

6) Energy supplied by a source of energy.

Difference of Boiling and Evaporation

Question 2: Describe thermal expansion of matter.

Thermal expansion is the tendency of a matter to change in shape, area and volume in response to the change in temperature, through heat transfer.

Solid has greater intermolecular forces than liquid and gas so thermal expansion order of three states of matter is:- gases > liquid > solid

Question 3: Describe linear, area and volume expansion.

Thermal expansion. It is usually expressed as a fractional change in length or volume per unit temperature change; a linear expansion coefficient is usually employed in describing the expansion of a solid, while a volume expansion coefficient is more useful for a liquid or a gas.

Question 4: Compare expansivity in Solids, Liquids and Gases.

Heating makes the particles expand or become loose.

Cooling makes the particles contract or tight.

Gas expand the most

So

Solid can't be expand it have definite shape.

Liquid can be partially expand .

Gas can be highly expand .

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Very Important Questions

1. Difference between boiling and evaporation ?
2. Thermal Expansion ?
3. Linear Expansion ?
4. Volume Expansion ?
5. Superficial Expansion ?
6. Compare Expansion in Solids, Liquids and Gases ?
7. Examples and Real world applications of Expansion ?