Question

explain the construction and working of clinical thermometer ​

Answer 1

Answer:

Explanation:

a clinical thermometer works on the principle of expansion of fluid (here mercury) . mercury is a dense liquid metal having high surface tension and wont stick to the glass surface like water do...if water was used instead. also when temperature rises mercury rises in the provided column due to capillary action . all matter has a volume co-efficient of thermal expansion denoted as γ  . that is how much the substance will expand per kelvin of temperature rise. and its value for mercury is about 0.00018 which means the volume of mercury will increase by 0.00018$m^{3}$ for a 1 kelvin rise in  temperature . The mathematical equation can be formulated as V = v γ ΔT ( v is the initial volume  γ co-efficient of thermal expansion denoted ,ΔT is change in temperature and V is final volume ). and nowadays mercury clinical thermometers are replaced by digital ones....which works on other thermometric properties other than expansion like electrical resistance