Why the level of mercury should change at all when the bulb of the thermometer is brought in contact with another object class 7?

Why the level of mercury should change at all when the bulb of the thermometer is brought in contact with another object class 7?

Best Answer The temperature of other object may not be the same as that of the bulb of the thermometer. Whenever, bulb is brought in contact with that object, the temperature of the bulb changes. So the level of mercury also changes.

Why the level of mercury should change when the bulb of the thermometer is brought in contact with another object?

The level of mercury should change at all when the bulb of the thermometer is brought in contact with another object because a liquid changes its volume relative to its temperature.

Why does the level of mercury rise when it comes in contact with hot objects?

In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object because mercury expands when the temperature is increased and hence it rises in the capillary tube.

WHY DO level of mercury rises when we keep clinical thermometer under our tongue?

Answer: As the temperature increases, then expansion in mercury takes place which leads to the rise in the level of mercury in thermometer.

Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth?

The mercury does not fall or rise in a clinical thermometer when taken out of the mouth because of the presence of kink. It prevents mercury level from falling on its own.

Why the level of mercury should?

It is because a liquid changes its volume relative to its temperature and should be changed at all when the bulb of the thermometer is in contact with another object.

Why does the level of mercury rise/fall or stay in the middle?

As the temperature rises, the mercury is pushed up through the constriction by the force of expansion. When the temperature falls, the column of mercury breaks at the constriction and cannot return to the bulb, thus remaining stationary in the tube.

Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth Class 7?

Why does a mercury expand?

The expansion occurs because the atoms in a material vibrate more strongly as you add heat energy to them; as the vibrations increase, the average distance between atoms also increases.

Why mercury is present in clinical thermometer?

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.

What should be the level of mercury in the clinical thermometer before use?

Precautions in Using a Clinical Thermometer (1) The clinical thermometer should be washed before and after use. (2) Before using the clinical thermometer, we should ensure that the mercury level in its tube is below 35°C mark.

Why does the mercury not fall or rise in a clinical thermometer?