Table of Contents
Why mercury is used in thermometer give four reasons?
It has a lower freezing point (-39°C) and a high boiling point (35°C). Hence it can be used over a wide range of temperature. It is shiny liquid metal, hence can be easily seen through the glass of the thermometer tube. It has a fairly large expansion for a small change in temperature.
Why do we use mercury in thermometers give three reasons?
Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion. It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn’t stick to the glass surface of glass.
What are the advantages of mercury in glass thermometer?
It is a good conductor of heat and hence, can measure even high temperatures. It gives results quickly – has a fast response time. It expands linearly and less than alcohol and any other liquid. It is more durable than alcohol thermometer because mercury does not evaporate easily.
What are the reasons for using mercury in a thermometer instead of alcohol?
There is a technical reason for using mercury in clinical thermometers. Mercury has a greater coefficient of thermal expansion than alcohol. This means a column of mercury will expand and rise more than a column of alcohol for the same temperature change. As a result, you can get finer readings with mercury.
What is the role of mercury in thermometer?
Mercury is the only metal that is in liquid state at room temperature. It is used in thermometers because it has a high coefficient of expansion which makes it easy to move in the thermometers as per the temperatures. Mercury has a boiling point which makes it suitable to measure higher temperatures.
What are the disadvantages of mercury in glass thermometer?
What are the disadvantages of mercury?
- It cannot measure very low temperature, because its freezing point is high (-40ºC)
- Mercury is poisonous, so it harmful if its tube is broken.
- Its price is very high.
- display is harder to read.
- cannot be used for thermograph.
- slow response.
- fragile.
What is difference between alcohol and mercury thermometer?
Main Difference – Alcohol vs Mercury Thermometers A thermometer is a device that is used to measure the temperature. The main difference between alcohol and mercury thermometer is that the bulb of mercury thermometer is filled with mercury whereas the bulb of alcohol thermometer is filled with an alcohol.
Why is mercury used as a liquid in a thermometer?
Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion. Why is mercury used in thermometers despite being the poorest conductor of heat? Most metals are good conductors of heat and they are solids at room temperature.
Why is mercury used as a heat conductor?
Mercury is not easily vaporized even at low temperatures. It is a metal, so it’s a good conductor of heat. This means that it reacts quickly to changes in temperature. The increase of mercury is steady or linear to the changes of the heat, except for actual high temperature.
Why was the first liquid in glass thermometer made?
The urge to develop a device that solely responded to heat led Joseph Delmedigo, a student of Galileo’s, to invent the first sealed liquid-in-glass thermometer. This was the first thermometer because it was marked with a scale.
Which is the only metal in liquid state at room temperature?
Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion.