Table of Contents
How are modern thermometers made?
How are modern thermometers made? The most common kind of thermometer consists of a liquid, such as alcohol or mercury, in a very thin, hollow glass tube. Instead, what actually happens is that the liquid expands more than the glass and moves up the capillary, registering a change in temperature.
How was the first thermometer made?
One of the first thermoscopes was developed by Italian inventor, Galeleo Galilei in 1593.It used water as the liquid and glass bulbs inside an open tube. The glass bulbs rose and fell with the changes in temperature.
Is there still mercury in thermometers?
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.
What materials are thermometers made of?
Mercury is one of the most familiar materials used in liquid thermometers. Other liquids, such as kerosene or ethanol, may also be used in these types of thermometers.
What are thermometers filled with?
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.
Which metal is filled in thermometer?
Mercury
Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion.
What material is used to make thermometers?
The glass material forming the body of the thermometer is usually received from an outside manufacturer. Some thermometer products are made with an enclosure, which can be made of plastic or composites and may contain scale gradations as opposed to having these on the glass tube itself.
What does the thermometer actually measure?
Liquid thermometers. Photo: This thermometer contains a red,alcohol-based liquid and is marked with both a Celsius scale (left) and a Fahrenheit scale (right).
What is the most accurate outdoor thermometer?
The digital or electronic outdoor thermometer is the most modern and is also considered to be the most accurate. Inside the thermometer is a thermoresistor that alters its resistance according to the temperature. Next, a sensor on the micro-computer reads the temperature and digitally displays it.
What are modern thermometers made of?
The most common kind of thermometer consists of a liquid, such as alcohol or mercury, in a very thin, hollow glass tube. It works because of the fact that liquids expand more than solids as their temperatures increase.