Question

A manufacturer of liquid-in-glass thermometers changes the design in order to meet new requirements.

Describe the changes that could be made to
(i) give the thermometer a greater range,

(ii) make the thermometer more sensitive.
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Answer 1

Answer:

(i) give the thermometer a greater range,

The range of a liquid-in-glass thermometer is limited by the length of the thermometer and can be increased by: increasing the diameter of the capillary – this means that the liquid will not expand as far along the tube per degree rise in temperature

(ii) make the thermometer more sensitive.

Sensitivity of Thermometer. Using a thermometer with a smaller bulb – A smaller bulb contains less mercury and hence absorbs heat in shorter time. A glass bulb with thinner wall – Heat can be transferred to the bulb easily. Capillary with narrow bore – produces a greater change in the length of the mercury column.

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