Question

4. Name the three modes of heat transfer.
5. Write two similarities and two differences between a laboratory thermometer and
clinical thermometer.​

Answer 1

4.  3 modes of heat transfer are :-

• Convection
• Radiation
• Conduction

5.     Laboratory thermometer is used in labs for accurate measurement of temperature.

• It normally contains alcohol
• It normally ranges from -30 c to 120 c

Clinical thermometer is used at homes and clinics

• It normally has mercury

• It ranges from 35 c to 42 c

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Answer 2

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Answer..4

1. Convection - The method of transferring heat by the movement of the particles of substance away from the source of heat is known as convection. It takes place only in liquids and gases...
2. Conduction - The process of transferring of heat from the hotter end to the colder end of an object is known as conduction. Whenever a utensil is kept on flame it becomes hot and the heat travels from the base of the utensil to its handle...
3. Radiation - All hot bodies emit heat by the process of radiation. Radiation of heat does not require a medium. Sunlight comes to the earth because of radiation as there is no medium present between the atmosphere of the earth and the sun. The temperature of an object increases because of absorption of heat. ...

Answer..5

• SIMILARITIES

1. Both thermometers consist of long narrow uniform glass tubes .
2. Both have a bulb in one end.
3. Both contain mercury in bulb .
4. Both has celcius scale..

• DIFFERENCES

1. Clinical thermometer reads temperature 35°C to 45°C while the range of laboratory thermometer is -10°C to 110°C..
2. Clinical thermometer has link near the bulb while laboratory thermometer doesn't have a kink.
3. We can only measure our body temperature using clinical thermometer while laboratory thermometer doesn't have a kink..

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