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Why does a mercury-in glass thermometer first drop slightly when placed in boiling water?
When placed in boiling water, the materials comprising the thermometer respond in the order in which the heat penetrates them. As the heat first permeates the glass cylinder, the cylinder expands, enlarging the bore. For the moment until the mercury is also heated, the constant volume of mercury fills the expanded bore to a slightly lower depth. When the heat reaches the mercury and it also expands, its volume to increase, and the liquid depth rises in the bore.
What happens to the mercury level when the cold thermometer is kept in a hot tub of water?
The answer is: when it is kept so the mercury level in the tube increases showing the temperature
Why is mercury used in thermometer instead of water?
Mercury is a good conductor of heat and it expands to certain levels when heated to certain temperatures.In addition:Water would freeze when the temperature went below 32 degrees F. or 0 degrees C. See the related link for more information. Mercury has a higher boiling point and hence would not evaporate after 100 degree Celsius, like water, and this enables us to measure temperatures beyond it but if we see that as mercury is an good conductor of heat and it is expand to its level when we heat
Why water is not used in thermometer?
Well, Mercury can't freeze or evaporate at the temperature recorded on a standard thermometer. If water were used in a thermometer, we wouldn't be able to record any temperatures below its freezing point (0 degrees Celsius) or above its boiling point (100 degrees Celsius. Mercury has many unique properties. It is a liquid metal and as a metal it expands when heated. When the mercury is heated it rises in the thermometer. And markings on the glass indicate the temperature. Water does not do this. But now in this Digital World mercury has been loosing its importance just because everyone wants to use Digital Technology which provide fast and accurate reading and also safe in use, no doubt mercury provides an accurate reading of temperature but it is not fast and safe as compared to Digital Thermometer.
How long does it take for sunlight to heat up water in a dark colored cup?
Sounds like an experiment you could do, all you need is a cup, water, and a thermometer. If you can get two thermometers try it with one white cup and one dark colored one.
Which thermometer is most suitable for measuring boiling point of water mercury or alcholic thermometer?
Which thermometer is most suitable for measuring boiling point of water mercury or alcoholic thermometer
What is the most suitable thermometer for measuring boiling point of water?
- a thermometer with mercury - a thermometer with thermoresistance
What is the clear liquid inside a Galileo thermometer?
mercury
Which instrument is often filled with mercury or colored water or alcohol?
Thermometers are the instrument that is often filled with mercury, colored water, or alcohol. Most early thermometers were made with mercury.
When was the did the water thermometer invented?
i think you mean a mercury theremometer
What does a thermometer contain water or Mercury?
If it's a silver liquid it's mercury, if it's red it's alcohol (not water)
Why mercury is use instead of water in a thermometer?
when measure a very hot body with water inside the thermometer, the glass will break or the water will evaporate, similarly if we measure a cold body with the water again the water inside will freeze and we wont know thew correct measure
What was the first liquid used in a thermometer?
The first thermometer was a tube filled with water and air.
What would you measure water temperature with?
A mercury thermometer (but not a medical one!)
Why is alcohol and mercury in liquid thermometer than water?
Water freezes at too high a temperature.
What will the mercury thermometer show when it is kept in ice?
The question must be asked carefully. If the thermometer is in water ice and there is no liquid water, and there is one atmosphere of pressure, the thermometer can read anything from the freezing point of water and lower, depending on the range of the thermometer. If the thermometer is in a stable mix of water and ice, it will read the freezing point of water.
Why should not use water in the thermometer?
One of the problems with water in a thermometer is the effect of capillary action - the column of water tends to "stick" to the sides of the thermometer and create a U-shaped surface at the top. This makes it very difficult to read the thermometer. Previously mercury was considered to be a good medium for thermometers, but this has been discontinued due to the health risks from a broken mercury thermometer; the current medium in thermometers is dyed ethanol or methanol.
