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Mechanical Properties Of Fluids

Question
CBSEENPH11019466

Two thermometers are designed in same way except that one has a spherical bulb and other an elongated cylindrical bulb. Which will respond quickly to temperature change?

Solution
The flow of heat is proportional to the surface area or area of cross-section. We know that, the surface area of a cylindrical bulb is more than that of spherical surface. Therefore, the thermometer with cylindrical bulb responds more quickly to temperature change than the thermometer with spherical bulb.