Why is mercury and alcohol used in thermometers?

because of high cofficient of expansion. mercury and alcohol is used in thermometer because they expand at a fixed rate when it is heated , hence a slight change in temperature will increase the expansion a long way up the tube..

Why do we use mercury in thermometers can water be used instead of mercury What are the problems in using it?

We use mercury in thermometers as they remain in liquid form even with a change of temperature in it. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube. Due to this constraints it is not used as a thermometric liquid.

Why is alcohol used in place of mercury?

Answer: alcohol thermometers are used rather than Mercury thermometers in very cold regions because alcohol has a lower freezing point than Mercury.

Why is alcohol used in a thermometer?

Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. The ethanol version is the most widely used due to the low cost and relatively low hazard posed by the liquid in case of breakage.

What is mercury class7?

Mercury is the only metal that is in liquid state at room temperature. Mercury has a boiling point which makes it suitable to measure higher temperatures. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked.

What do we use mercury as a fluid in thermometer and not water?

We use mercury in thermometers because most metals are good conductor of heat and mercury is the only metal in liquid state. No,we cannot use water instead of mercury because water do not expand as per temperature given to it and can give us wrong reading.

Why is mercury red in a thermometer?

Silver liquid indicates that the thermometer contains mercury, while red liquid is alcohol to which red coloring has been added. Although uncommon in modern thermometers, a clear color indicates water.

What is mercury of 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.

What are the liquids used in thermometer?

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 is a mercury thermometer used for?

Why mercury is used in thermometer Mcq?

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 is the difference between a mercury and alcohol thermometer?

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. Thermometers rely upon thermal expansion of the liquid in a bulb at the base of a thin glass tube.

Why are mercury thermometers used in clinical thermometers?

Mercury is used in clinical thermometers for two reasons. First, its the only metal that remains in a liquid state at room temperature. And, mercury has a very high coefficient of expansion which means very small changes in temperature cause it to expand..

What is the only metal that is liquid at room temperature?

The simple answer is, the metals like iron, copper, aluminum, etc are solids at the room temperature. So, Mercury is the only metal which is in liquid state at room temperature. Now you might have a question that why can’t we use water in thermometers? Water is liquid at room temperature.

Why can’t we use metals in thermometers?

The simple answer is, the metals like iron, copper, aluminum, etc are solids at the room temperature. So, Mercury is the only metal which is in liquid state at room temperature. Now you might have a question that why can’t we use water in thermometers? Water is liquid at room temperature. So scientists should have used water in the thermometer.