Why does the level of mercury change when the bulb of thermometer is kept inside the mouth?

Answer: As other answers have correctly stated, it is because of the constriction in the tube between the bulb and scale.

Why does the mercury level of a thermometer first decrease slightly when the thermometer is first placed in warm water?

The column of mercury descends slightly because glass expands first before the mercury.

Why does the mercury in a thermometer rise when the temperature goes up?

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 does the mercury not rise or fall 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.

Does mercury levels fall or rise in a clinical thermometer when taken out of the mouth Why?

As such it takes more time to reach a given temperature marking, and also doesn’t fall rapidly as the temperature starts falling. Therefore, the kink near the bulb in a clinical thermometer prevents the level of mercury from falling when taken out of the mouth.

Can you explain why the column of mercury first descends and then rises when a mercury in glass thermometer is put in a flame?

Q: Why does the column of mercury first descend and then rise when a mercury in glass thermometer is put into a flame? Glass being a bad conductor of heat , does not transmit heat immediately to the mercury . Mercury is heated subsequently , so its level rises later .

Why the rising level in mercury column stops after a while?

Mercury continues to rise slowly after stopping inflation. This is caused by the air at the top of the column failing to escape through the top leather disc quickly enough as the mercury rises up the column.

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

What happens to mercury when temperature increases?

As the temperature rises, the mercury is pushed up through the constriction by the force of expansion.

What does it mean when mercury is stuck at the bottom of a thermometer?

I’m wondering if he can do anything about this. . . . without thinking, blew on it with all of his might. (p.

What makes mercury rise?

The mercury pools in the bulb, but when it heats up, it expands. Because it can’t expand through the bottom of the bulb, it is forced up the tube. That expansion, caused by the atoms flying around faster and taking up more space, is what makes the thermometer work.

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.

Why does the Mercury not fall or raise in a thermometer?

There is a constriction above the bulb that not let the mercury return to it, but that let the mercury coming out in the tube as it expand with the temperature. the mercury does not fall or raise in a clinical thermometer because, when thermometer taken out of the presence of klink .

What happens to the thermometer when you touch the bulb?

The level in the thermometer changes when mercury expands or contracts. Mercury expands or contracts when heated or cooled. Touching the bulb to another object will heat or cool the mercury in the bulb if that object is at a different temperature.

What happens to Mercury when heated or cooled?

Mercury expands or contracts when heated or cooled. Touching the bulb to another object will heat or cool the mercury in the bulb if that object is at a different temperature. This process of heat transfer is called conduction. Glass is a good heat conductor, so it does not impede heat transfer.

How does Mercury expand in a light bulb?

Mercury, like most substances, has a positive thermal expansion coefficient, so the mercury expands as its temperature goes up (or contracts if it’s temperature drops). Since the volume of the bulb remains (mostly) constant, the liquid mercury flows into or out of the only direction it can: the narrow path above the bulb.