Samacheer Class 7 Science - Heat and Temperature

Clinical thermometer – Kink
Normal temperature of human body – 37°C
Heat – A form of energy
Boiling point of water – 100°C
Melting point of water – 0°C

Kodaikanal has greater temperature.
Temperature of srinagar (J &K) = -4°C
Temperature of = 3°C
Difference = -4°C + 3°C = 7°C
Srinagar is colder than that of kodaikanal.

It is wrong, because clinical thermometer has small temperature range (35°C to 42°C or 94°F to 108°F). If it is used to measure the temperature of hot water, the glass will crack/ burst due to excessive pressure created by expansion of mercury.

A kink is clinical thermometer prevents the mercury from flowing back into the bulb when the thermometer is taken out of the patient’s mouth, so that the temperature can be noted conveniently.

The jerk to the thermometer will allow the mercury level to flow into the bulb so that the mercury level is below the normal temperature.

We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
A small change in the temperature causes change in volume of a liquid.
Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
Due to this constraints it is not used as a thermometric liquid.

Yes, I agree with Ramani.
Laboratory thermometer does not have a kink. So, when Swathi takes out the thermometer, the level can go back because of absence of kink.
So Swathi should note the reading when the thermometer bulb has surrounded by hot water.

Similarities between laboratory thermometer and the clinical thermometer:
Both clinical and laboratory thermometers have long, narrow and uniform glass tubes.
Bulbs contain mercury.
Both have Celsius scale.
Differences:
Laboratory thermometer:
Laboratory thermometer is generally scaled from -10°C to 11 CPC.
Mercury level falls on its own as no kink is present.
Temperature is read while keeping the thermometer in the source of temperature, e.g. a liquid or any other thing.
No need to give jerk to lower the mercury level.
It is used to take temperature in laboratory.
Clinical thermometer:
Clinical thermometer is scaled from 35°C to 42°C or from 94°F to 108°F.
Mercury level does not fall on its own, as there is a kink near the bulb to prevent the fall of mercury level.
Temperature can be read after removing the thermometer from armpit or mouth.
To lower the mercury level jerks are given.
It is used for taking the body temperature.

According to the question, F = 2C and C 1 = C
F = \(\frac { 9C }{ 5 }\) + 32
2c =\(\frac { 9 }{ 5 }\) C + 32
2c – \(\frac { 9 }{ 5 }\) c = 32 ⇒\(\frac { 10c – 9c }{ 5 }\) = 32 + 0
\(\frac { 1c }{ 5 }\) = 32

The temperature within the bottle reduces causing the air to cool down. This causes the balloon to contract.
When gases substance gets heat, it expands; when it cools it contracts.

During summer, the air inside the tyre of a vehicle will get heated up with the increase in pressure of the air inside the tyre. As there is no place to air to escape tyre will get bursted.