Give short note on liquid-in-glass thermometer.

1.	Give short note on liquid-in-glass thermometer.
Answer» 1. Liquid-in-glass thermometer depends on the change in volume of the liquid with temperature. 2. When the bulb is heated, the liquid in a glass bulb expands upward in a capillary tube. 3. The liquid is such that it is easily seen and expands (or contracts) rapidly and by a large amount over a wide range of temperature. 4. Most commonly used liquids are mercury and alcohol as they remain in liquid state over a wide range. Mercury freezes at -39 °C and boils at 357 °C; alcohol freezes at -115 °C and boils at 78 °C.

Answer»

1. Liquid-in-glass thermometer depends on the change in volume of the liquid with temperature.

2. When the bulb is heated, the liquid in a glass bulb expands upward in a capillary tube.

3. The liquid is such that it is easily seen and expands (or contracts) rapidly and by a large amount over a wide range of temperature.

4. Most commonly used liquids are mercury and alcohol as they remain in liquid state over a wide range. Mercury freezes at -39 °C and boils at 357 °C; alcohol freezes at -115 °C and boils at 78 °C.

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