What is an alcohol thermometer? What to do?

Alcohol thermometer is a tool used by many families in life for different purposes. So what is a alcohol thermometer and what is it for? Let’s find out about alcohol thermometers with Tnhelearning.edu.vn right away!

What is an alcohol thermometer? Advantages and disadvantages and uses

An alcohol thermometer (red thermometer) is a type of thermometer that uses an alcohol-filled bulb as a temperature sensor. Alcohol thermometers are used to measure temperatures from -115 degrees Celsius to 78.5 degrees Celsius . The liquid inside the bulb can be pure ethanol, toluene, kerosene or any other suitable ingredient depending on the application.

Alcohol thermometer is a product that can replace mercury thermometer and also has the same function as measuring the temperature of water, environment, atmosphere, …

Advantages of alcohol thermometer:

• Can measure low temperature.
• Accurate temperature measurement.
• Less toxic and less dangerous than mercury thermometers.

Disadvantages of alcohol thermometer:

• Temperatures above the boiling point of the liquid inside the bulb cannot be measured.
• The capillary wall is wet with alcohol
• The liquid should be stained before filling the bulb.
• Less stable because alcohol evaporates quickly.

Why do thermometers contain alcohol and some contain mercury?

Thermometer is an instrument used to measure temperature . Commonly used thermometers include: mercury thermometers and alcohol thermometers . Mercury and alcohol are the main ingredients that make up a thermometer called a thermometer.

However, for mercury and alcohol of the same mass, if their temperature is increased by 1°C, respectively, the heat absorbed by alcohol is about 20 times greater than that of mercury .

As can be seen, the sensitivity in temperature variation of the mercury column in the mercury thermometer is much greater than that of the alcohol column in the alcohol thermometer .

Therefore, in scientific experimental work or measuring human body temperature with rapid accuracy, people often use mercury thermometers. When measuring the ambient air temperature and water temperature in general, alcohol thermometers are often used.

Alcohol and mercury also have different properties: alcohol is “cold-resistant” very well at – 117°C , it solidifies, and mercury at -31°C solidifies and loses its fluidity. motion.

Therefore, mercury thermometers are often used to measure high temperatures, and alcohol thermometers are often used to measure places with low temperatures.

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