Why is the liquid of the thermometer placed in direct sunlight higher in the glass tube?

If the thermometer is kept in direct sun for a longer period of time the temperature of its sensor will increase due to direct heat radiation from sun falling on it. Therefore, it will show a temperature higher than the true ambient temperature.

What increases the sensitivity of a liquid in glass thermometer?

The sensitivity of a mercury thermometer can be increased by using a smaller mercury bulb, thinner wall and smaller bore. A smaller bulb contains less mercury and hence absorbs heat in shorter time. As a result it can response faster to temperature change.

How does the temperature of water affect its refractive index?

A higher temperature means the liquid becomes less dense and less viscous, causing light to travel faster in the medium. This results in a smaller value for the refractive index due to a smaller ratio.

Do thermometers have mercury?

The oldest thermometers used are mercury in glass. Newer thermometers include non-mercury liquids in glass and digital and electronic devices that use sensors to measure temperature. Thermometers that check body temperature in the ear, across the forehead, or have a digital display do not contain mercury.

Why does liquid in the thermometer rise when?

The liquid in the thermometer goes up when the thermometer is heated because heating makes the alcohol molecules of the liquid move faster. The extra speed of the molecules competes with their attraction for one another and causes them to move slightly further apart.

Why does liquid rise in a thermometer?

The way a thermometer works is an example of heating and cooling a liquid. When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer.

What factors affect the sensitivity of a thermometer?

Some of the factors which increase sensitivity are:

• Using a thermometer with a smaller glass bulb, as a smaller bulb contains less liquid and therefore, absorbs heat in a shorter time.
• Using a narrow tube, as a small change in volume results in the liquid moving a larger distance along the tube.

What are liquid-in-glass thermometers?

Best Glass Thermometers In the past, that liquid was usually mercury. However, many glass thermometers today contain a red liquid called spirit instead of mercury. If the liquid in your glass thermometer is silver-colored, it contains mercury.

How does refractive index depend on temperature?

Refractive index of a medium decreases with the increase in temperature. With increase in temperature, the speed of light in that medium increases; thus, the refractive index (= velocity of light in vacuum/velocity of light in medium) decreases.

What are liquid in glass thermometers?

What do F and C mean in thermometer?

There are two scales used for taking temperature: Fahrenheit (F) and Centigrade (C).

Why does a thermometer rise up when heated?

Because the liquid in the thermometer expands when it is warmed. As it expand it takes up more space and therefore rises up the measuring tube of the thermometer.There is liquid in some thermometer but, most have chemicals in it!!!!!!!!!!! Wiki User ∙ 2009-05-15 02:15:53

Why is the bulb of thermometer touched with the surface?

When we have to measure temperature, bulb is touched with the surface. Bulb contains mercury or alcohol in it. Holding thermometer by bulb will cause mercury or alcohol to expand or contract, due to body temperature. Hence we will not obtain correct reading of tempreture.

What is the function of liquid in glass thermometer?

The liquid in glass thermometer, is the most commonly used device to measure temperature and it is inexpensive to make and easy to use. The liquid in glass thermometer has a glass bulb attached to a sealed glass tube (also called the stem or capillary tube). A very thin opening, called a bore, exists from the bulb and extends down the centre

Can you read temperature with a glass thermometer?

Reading temperature via liquid-in-glass thermometers call for brilliant eyesight. Liquid element contained in a glass thermometer may be perilous or risky to health owing to their potential chemical spills. These thermometers display temperature either in Celsius or Fahrenheit scales.