4 Answer the following questions in brief.
a)Write the names of the most commonly used temperature sca
by Convert 50°F to °C.
b) Why is mercury preferred as a thermometric liquid?
c) Name one liquid apart from mercury which is commonly used
of that thermometer
d) Wły does the capillary of a clinical thermometer have a kink
Answers
(a) Kelvin scale
(b) Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.
(c) ethanol
Ethanol-filled thermometers are used in preference to mercury for meteorological measurements of minimum temperatures and can be used down to −70 °C (−94 °F). The physical limitation of the ability of a thermometer to measure low temperature is the freezing point of the liquid used.
(d) Its temperature scale runs from 35 C to 42 C (95 F to 110 F). The stem of the thermometer consists of a thin capillary tube. The capillary tube is scaled to show the temperature. ... Therefore, the kink near the bulb in a clinical thermometer prevents the level of mercury from falling when taken out of the mouth.
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