Why mercury thermometer is used to measure the high temperature but the alcohol thermometer is used to measure the lower temperature?

Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. Pure ethanol freezes at -115 degrees C, while mercury freezes at -38 degrees C.

Why should thermometer be used to measure high temperature?

In a maximum thermometer, the liquid is pushed up the glass tube, but cannot fall easily when the temperature lowers. The maximum temperature over a set period of time can be observed after the thermometer is removed from the environment. Maximum thermometers are commonly used to measure a person’s body temperature.

Why we prefer mercury to be used in thermometer give five reasons?

Mercury is best suited as a thermometric liquid:

• It expands uniformly when heated.
• It has low specific heat capacity.
• I has a high boiling point (357 °C) and a low freezing point (-39 °C).
• It is a good conductor of heat.
• It does not stick to the walls of the glass tube.
• It is opaque and shiny and hence clearly visible.

What is the advantage of mercury 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.

Why is mercury not used to measure very low temperature?

As the freezing point of mercury is -38.8 degrees centigrade, it is not possible to measure temperatures below this value. So, the mercury thermometer is not preferred to measure low temperatures (below -38.8 degrees centigrade)

What is used to measure high temperature?

pyrometer
pyrometer, device for measuring relatively high temperatures, such as are encountered in furnaces. Most pyrometers work by measuring radiation from the body whose temperature is to be measured.

What are the advantages of using mercury in thermometer?

Advantages

• 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.

Why is mercury used as thermometer liquid give three reasons?

Mercury is used as a thermometric liquid because: It has a lower freezing point (-39°C) and a high boiling point (35°C). 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.

Is not the advantage of using mercury in thermometer?

Class 7 Question. 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. Hence, the slightest change in temperature is notable when it’s used in a thermometer.

What are the advantages of using mercury?

Advantages of mercury as a thermometric liquid. -It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. -It does not wet (cling to the sides of) the tube. -It expands uniformly (linear expansion) and responds quickly to temperature changes, hence is sensitive.

Why is mercury used as an indicator in a clinical 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.

Why is mercury used in blood pressure monitors?

Expert Answers. Mercury is used in blood pressure measurement in blood pressure monitors or sphygmomanometers. The device consists of a mercury manometer in which mercury rises to a certain height in response to blood pressure. Mercury has traditionally been used in pressure measurements (in manometers) and in thermometers.

Can a broken thermometer cause mercury poisoning?

A broken mercury-containing thermometer can be toxic if the vapors are inhaled. The risk of poisoning from touching or swallowing mercury from a broken thermometer is low if appropriate clean-up measures are taken.

Is Mercury in thermometers toxic?

Mercury is highly poisonous, and the mercury inside of a thermometer can have dangerous health effects if you are exposed to it directly. Mercury is a toxin that affects the neurologic system of your body; its vapor can cause mood swings, insomnia and memory loss, and high vapor levels can damage organs.

What is thermometer used for in chemistry?

A thermometer is used to measure the temperature of different materials or substances. It can be used for solids, liquids or even gases. A typical thermometer contains a liquid solution inside, which is often mercury.