why the level of mercury in a laboratory thermometer change when it is touched with another object for ex.
while measuring the temperature of water put in a glass it is said to not to touch the surface of glass because the temperature will change even when it will sill be surrounded by water
why the level of mercury in a laboratory thermometer change when it is touched with another object for ex.
while measuring the temperature of water put in a glass it is said to not to touch the surface of glass because the temperature will change even when it will sill be surrounded by water
Unlike a clinical thermometer, a mercury thermometer does not have any kink. So, as soon as there occurs a drop or a rise in temperature, the mercury falls or rises immediately and hence quick changes in the level of mercury are observed. This is why it is advised that while working in a laboratory, a thermometer should not be brought in contact with some other objects, otherwise very abrupt changes in temperature would be observed. With glass, care has to be take in order to avoid breaking of the mercury bulb in case it strikes hard against the surface of the glass.
Unlike a clinical thermometer, a mercury thermometer does not have any kink. So, as soon as there occurs a drop or a rise in temperature, the mercury falls or rises immediately and hence quick changes in the level of mercury are observed. This is why it is advised that while working in a laboratory, a thermometer should not be brought in contact with some other objects, otherwise very abrupt changes in temperature would be observed. With glass, care has to be take in order to avoid breaking of the mercury bulb in case it strikes hard against the surface of the glass.
