How does a liquid thermometer measure temperature?

A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls. The tiny size of the bulb and micro-fine size of the tube help the mercury reach the temperature of what it is measuring very rapidly.

How accurate are liquid-in-glass thermometers?

Organic-Liquid-Filled Glass Thermometers contain nonhazardous liquid in a graduated scale tube which closely resembles their mercury predecessors. The accuracy of a typical glass thermometer is ±1 scale division.

Where can glass thermometers measure temperature?

where can glass/mercury thermometers measure temperature? can be used for oral, rectal, and axillary or groin temperatures.

How does a floating glass thermometer work?

Galileo thermometers work on the principle of buoyancy, which determines whether objects float or sink. As the temperature changes, the glass balls will either sink to the bottom (temperature rises), or float to the top (temperature falls).

What is a liquid in glass thermometer?

It consists of mercury as a liquid filled in a glass tube. On the body of the glass tube, calibrated marks are provided which facilitates the reading of temperature. A bulb is formed at one end of the thermometer which contains the largest part of mercury.

What is the physical property that changes with temperature in a liquid in glass thermometer?

A thermometer has a liquid in a very narrow tube, which when heated will expand and move up the tube. If you cool the liquid down, then the liquid will contract and move back down the tube. So the physical property used in a thermometer is thermal expansion.

What is the main advantage of liquid in glass thermometer?

Following are the major advantages associated with the use of liquid-in-glass thermometers: They are comparatively cheaper than other temperature measurement devices. They are handy and convenient to use. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging.

Why is glass used in thermometers?

Glass has a very low coefficient of thermal expansion. This is the reason why thermometer bulb or for a matter of fact entire thermometer is made up of glass. Due to low coefficient of thermal expansion, when the thermometer undergoes a large temperature change it will have minimal change in dimensions.

What is liquid glass thermometer?

The fluid/glass thermometer is the most popular thermometer used around the world to measure body temperature. It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. Increasing the temperature expands and pushes up the fluid in the reservoir and tube.

What is the liquid in a floating thermometer?

ethanol The clear liquid in a Galileo thermometer is ethanol, a colorless volatile liquid with very little odor. Although its density is less than water, it varies depending on the temperature, even more so than water.

Why Galileo thermometer is not accurate?

There is also the minor detail that Galileo thermometers are not exactly precision instruments. A small one can have 6 degrees (F) of difference between the balls, which make for quite a measurements range of error. Even larger models have at least a couple of temperature difference between the diver globes.

What makes a liquid in glass thermometer sensitive to a small change of temperature?

The Sensitivity of Liquid Thermometers The liquids used in liquid-in-glass thermometers are chosen for their thermal expansion properties: They expand linearly with temperature. They expand significantly, giving them greater sensitivity.

What is the difference between clinical thermometer and liquid in glass thermometer?

A laboratory thermometer, which is colloquially known as the lab thermometer, is used for measuring temperatures other than the human body temperature….Thermometers.

Clinical Thermometer	Laboratory thermometer
It has kink, which prevents immediate backflow of mercury	It does not have a kink

What are the advantages and disadvantages of liquid in glass thermometer?

Liquid in glass thermometers tend to be fragile and hence easily broken, can only be used where the liquid column is visible, cannot be used for surface temperature measurements, cannot be read from a distance and are unsuitable for high temperature measurements.

What is the liquid inside of a glass Galileo thermometer?

What is the clear liquid in a Galileo thermometer? The clear liquid in a Galileo thermometer is ethanol, a colorless volatile liquid with very little odor. Although its density is less than water, it varies depending on the temperature, even more so than water.

What liquid is in a Galileo glass thermometer?

What is the Galileo thermometer used for?

A Galilean thermometer is a device for measuring the temperature of a liquid based on the density variation with temperature. It is named after Galileo Galilei, the famous Italian physicist, who apparently invented it.

Why mercury is used as liquid in the glass 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 are liquid in glass thermometers?

Usually, mercury and petrolate are the most common fluids in this kind of thermometer. Mercury and petrolate usually can measure temperature in a range of −40 to +900°C and −200 to +260°C, respectively (2).

How is a clinical thermometer different from other thermometers?

The clinical thermometer is used to measure the body's temp. but an ordinary thermometer is used to measure any object's temperature. The clinical thermometer range is from 35o to 42o Celsius whereas the ordinary laboratory thermometer range is from -10o to 110o Celsius.

What liquid is in a temperature glass?

Temperature measurement The fluid used in the thermometer is normally either mercury or colored alcohol contained within a bulb and capillary tube, as shown in Fig. 14.18A. As the temperature rises, the fluid expands along the capillary tube and the meniscus level is read against a calibrated scale etched on the tube.

What liquid is in a glass thermometer?

mercury thermometer In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.

How does a mercury thermometer work?

In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.

Why does liquid in a thermometer rise with hot water?

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.

How is clinical thermometer different from normal liquid in glass thermometer?

The basic difference between clinical thermometer and other thermometer is the former is used to measure human body temperature. The later is the temperature of substances. Secondly for a clinical thermometer there's a constriction which does not allow flowing back of mercury when once used to measure temperature.

Why are glass thermometers not recommended?

Glass mercury thermometers are no longer recommended and can be dangerous. There are serious health risks if a glass mercury thermometer breaks. Mercury is toxic if inhaled or if the liquid touches the skin.

What is a liquid filled thermometer?

It is a glass thermometer that is also called "spirit filled." As the internal temperature of the food increases, the liquid inside the stem expands and rises to indicate the temperature on a scale.

Why does the liquid rise and fall in the tube of a glass thermometer?

The fluid/glass thermometer is the most popular thermometer used around the world to measure body temperature. It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. Increasing the temperature expands and pushes up the fluid in the reservoir and tube.

Why do liquid thermometer goes up and down?

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. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.