Why 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.
What happens when a thermometer is placed in water?
Item AM042005: When a glass thermometer is placed in hot water, the level of liquid rises because the molecules get farther apart. A glass thermometer has a colored liquid inside it. Heat causes the molecules of the liquid to get farther apart. The molecules of the liquid break down into atoms and take up more space.
Can you put water in thermometer?
Water is not helpful to measure below 0oC and above 100oC. The most metals are solids at room temperature but the mercury is liquid form because it has high coefficient of expansion. The mercury does not stick to capillary wall of thermometer and which can easily measure temperature accurately.
Why are thermometers filled with water?
The basic idea is that as the temperature of the air outside the thermometer changes, so does the temperature of the water surrounding the bubbles. As the temperature of the water changes, it either expands or contracts, thereby changing its density.
Why mercury is used in liquid thermometer?
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.
Can we use water instead of mercury?
Explain why water cannot be used in place of mercury in a barometer? The atmospheric pressure at sea level = 76cm of Hg = 1.013×105 Pascal. That is, if water is used in barometer tube instead of mercury, the length of the tube must be greater than 10.326 cm. So, we cannot replace mercury by water in the barometer.
What is the liquid inside the 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.
Can thermometer be washed with hot water?
A clinical thermometer can’t be washed with hot or very warm water, because the mercury inside the thermometer will expand to pass 115 F or 120 F.
Does meat thermometer work in liquid?
(Put the thermometer into any liquid, like milk; 32° to 40° F is a safe range.) Liquid thermometers are the most common type in use. They are simple, inexpensive, long-lasting, and able to measure a wide temperature span.
What liquid is inside Galileo thermometer?
The liquid in AcuRite Galileo Thermometers is 100% paraffin. The colored bulbs are filled with paraffin and 3.4% dye. The liquid is non-toxic. The dye inside colored bulbs may stain fabric.
What liquid is in a water thermometer?
This thermometer is based on an invention of Galileo Galilei. The liquid in a Galileo thermometer is water. Floating in the water within the tube are glass bubbles also filled with water containing simple food coloring, though sometimes alcohol might be used.
Can you use water as a liquid in a thermometer?
Water cannot be used in thermometer because of its higher freezing point and lower boiling point than other liquids. If water is used in a thermometer, it will start phase change at 0oC and 100oC and will not measure temperature, out of this range.
What’s the freezing point of water in a thermometer?
This range is very small as compared to other liquids as mercury , having freezing point about −39oC and boiling point 356oC . Was this answer helpful?
Why is mercury used instead of water in a thermometer?
This is one of the main reasons to use of mercury in thermometers. Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water. We can measure the negative and positive temperature by using the mercury but water cannot.
Why is water considered a proper liquid in terms of?
It must be purely in a thermometer context, because we all know that water is just about the most “proper” liquid there is! If your thermometer only has to work between, let’s say, 20-50 degrees C, water might be perfectly alright.
Water cannot be used in thermometer because of its higher freezing point and lower boiling point than other liquids. If water is used in a thermometer, it will start phase change at 0oC and 100oC and will not measure temperature, out of this range.
Why do we use mercury instead of water in a thermometer?
It is used in thermometer because it has high coefficient of expansion. Hence the slightest change in temperature is notable when it is used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperature. So instead of water mercury is used in thermometer.
This range is very small as compared to other liquids as mercury , having freezing point about −39oC and boiling point 356oC . Was this answer helpful?
It must be purely in a thermometer context, because we all know that water is just about the most “proper” liquid there is! If your thermometer only has to work between, let’s say, 20-50 degrees C, water might be perfectly alright.