Question

Answer the following questions in detail.
1. What is temperature? Describe the three main scales of temperature with the units, fixed points and
intervals of each.
2. Write any four practical applications of transfer of heat by conduction.
3. Explain with the help of labelled diagrams how land and sea breezes are formed.
4.
State the differences between three different modes of transfer of heat.
5. How does a thermos flask help to keep a hot drink warm? Draw a labelled diagram of a thermos flask.​

Answer 1

Answer:

temperature is a quantity which defines  the thermal state of a body or object

Explanation:

it is the degree of hotness or coldness of the body

Answer 2

Explanation:

1. There are three temperature scales in use today, Fahrenheit, Celsius and Kelvin. Fahrenheit temperature scale is a scale based on 32 for the freezing point of water and 212 for the boiling point of water, the interval between the two being divided into 180 parts.

2. Heat will transfer from a hot burner on the stove into a pot or pan. A metal spoon becomes hot from the boiling water inside the pot. Chocolate candy in your hand will eventually melt as heat is conducted from your hand to the chocolate. When ironing a skirt, the iron is hot and the heat is transferred to the skirt.

3. The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean. At night, the roles reverse. The air over the ocean is now warmer than the air over the land.

4 .Difference Between Conduction, Convection and Radiation

conduction, convection and radiationWhile conduction is the transfer of heat energy by direct contact, convection is the movement of heat by actual motion of matter; radiation is the transfer of energy with the help of electromagnetic wave.

Comparison Chart

BASIS FOR COMPARISON CONDUCTION CONVECTION RADIATION

Meaning Conduction is a process in which transfer of heat takes place between objects by direct contact. Convection refers to the form of heat transfer in which energy transition occurs within the fluid. Radition alludes to the mechanism in which heat is transmitted without any physical contact between objects.

Represent How heat travels between objects in direct contact. How heat passes through fluids. How heat flows through empty spaces.

Cause Due to temperature difference. Due to density difference. Occurs from all objects, at temperature greater than 0 K.

Occurence Occurs in solids, through molecular collisions. Occurs in fluids, by actual flow of matter. Occurs at a distance and does not heats the intervening substance.

Transfer of heat Uses heated solid substance. Uses intermediate substance. Uses electromagnetic waves.

Speed Slow Slow Fast

4. Heat transfer is minimised because of: ... (2) Cork in the neck of flask and the cup over it prevent loss of heat by convection. (3) Heat cannot be lost by conduction or convection because of vacuum between the two walls.