What happens to the volume of mercury in a thermometer as temperature increases?

2 Mercury Expansion Mercury’s volume coefficient of expansion is 0.00018, so it expands by . 018 percent in volume for every degree of temperature increase. To make the difference easier to see, a mercury thermometer contains a reservoir of the metal and a thin glass capillary into which it can expand.

Why does the mercury in a thermometer rise when temperature increases?

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.

Does mercury expand with heat?

When heated or cooled, mercury expands or contracts at a rate that is more constant than most other substances. Also, it has a wide range of temperatures between its boiling and freezing points.

Does mercury expand easily on heating?

Since it is a metal, it has a stable coefficient of expansion. Therefore, it expands easily and uniformly. Also, noticeably for a slight change of temperature. This is because mercury found its use in thermometers.

Does mercury expands on heating?

It expands uniformly on heating. The specific heat capacity of mercury is low. The boiling point of mercury is high (357∘C) and the melting point of mercury is low (−39∘C). It is a good conductor of heat.

Does mercury expand in heat?

Does temperature affect mercury?

Temperatures on Mercury are extreme. During the day, temperatures on the surface can reach 800 degrees Fahrenheit (430 degrees Celsius). Because the planet has no atmosphere to retain that heat, nighttime temperatures on the surface can drop to minus 290 degrees Fahrenheit (minus 180 degrees Celsius).

Why is mercury used in thermometer Class 8?

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 is temperature on mercury?

It is understood that the sunny side may reach temperatures of 750 to 800 degrees F., while the nighttime temperature plummets to nearly -330 degrees F. The average temperature on Mercury is a balmy 354 degrees F.

Why does the Mercury first fall then rise in a thermometer?

First when the thermometer is put inside the flame, the glass containing the mercury expands and this causes the liquid to initially fall since the glass tube becomes wider. Soon the heat reaches the liquid and this causes the liquid to expand causing it to rise. This explains why the mercury first falls and then rises. Prathum.

What causes the liquid in a thermometer to rise?

First when the thermometer is put inside the flame, the glass containing the mercury expands and this causes the liquid to initially fall since the glass tube becomes wider. Soon the heat reaches the liquid and this causes the liquid to expand causing it to rise.

How do you find the average volume expansion coefficient of mercury?

The average volume expansion coefficient b is defined through ΔV = βVΔT. The volume of the mercury will increase as the temperature rises and the mercury will rise in the capillary tube. The increase in temperature is 20 o C. The change in the volume of the mercury is

What is the volume of the Mercury in the capillary tube?

The volume of the mercury will increase as the temperature rises and the mercury will rise in the capillary tube. The increase in temperature is 20 o C. The change in the volume of the mercury is ΔV = βVΔT = (1.8*10 -4 ( o C) -1 ) (0.100 cm 3 ) (20 o C) = 3.6*10 -4 cm 3 = 0.36 mm 3.