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One thermometric property that is required is that it must vary linearly with temperature. In liquid-in-glass thermometers, the length of the liquid thread is often used to determine temperature. Thus when temperature increases, the liquid must expand uniformly with temperature, so that it can be used to measure temperature accurately.
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Why does the liquid in a thermometer go down before the temperature is taken?
It does not by itself. It must be shaken down. The liquid is mercury, which is very heat-expansive, i.e. it changes its volume noticeably and quickly depending on its temperature. The warmer, the larger the volume. That's why it's used in thermometers. However, thermometers are built so that the mercury does not go down by itself to enable taking precise readings (otherwise, it would fall quickly immediately after the thermometer is removed from the body). So, the thermometer must cool and the contracted but vacuum-stuck mercury must then be shaken down to take another measurement.
Why lab thermometer do not have kink?
the temparature of the liquid must be read while the thermometer is in the liquid.since the level of mercury drops as soon as the thermometer is taken out of the liquid ,therefore no need of the kink in thermometer.
What are the errors in the use of thermometer?
Some common errors in the use of a thermometer include not allowing it to equilibrate to the surrounding temperature before use, placing the tip in the mouth incorrectly or too quickly, and not properly cleaning and storing the thermometer after each use. Additionally, using a thermometer that is expired or damaged can also lead to inaccurate readings.
Why does the expansion of glass in liquid-in - glass thermometer ignored?
For the basic principle, it can be ignored, since the liquid expands more than the glass.For exact calculations, the expansion of glass must also be taken into account. In practice, however, you'll want to calibrate the thermometer with known temperatures (for example, the temperatures of freezing and boiling water) - in which case such calculations are both unnecessary and useless.
Why must a laboratory thermometer be left in place to take a reading?
A laboratory thermometer must be left in place to take a reading because the thermometer needs time to adjust and reach thermal equilibrium with the substance being measured. Moving the thermometer too soon can result in an inaccurate reading.
Why does the liquid in a thermometer go down before the temperature is taken?
It does not by itself. It must be shaken down. The liquid is mercury, which is very heat-expansive, i.e. it changes its volume noticeably and quickly depending on its temperature. The warmer, the larger the volume. That's why it's used in thermometers. However, thermometers are built so that the mercury does not go down by itself to enable taking precise readings (otherwise, it would fall quickly immediately after the thermometer is removed from the body). So, the thermometer must cool and the contracted but vacuum-stuck mercury must then be shaken down to take another measurement.
Why must the thermometer be placed near the mouth of the condenser?
The thermometer must be placed near the mouth of the condenser to accurately measure the temperature of the vapor as it exits the condenser. This location provides a direct indication of the condensation temperature, which is crucial for monitoring the efficiency of the condensation process. Proper placement ensures that the thermometer captures the temperature of the vapor just before it condenses into liquid, allowing for better control and understanding of the distillation or cooling process.
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.
What must be added to a solid before it will dissolve?
LIQUID
Why lab thermometer do not have kink?
the temparature of the liquid must be read while the thermometer is in the liquid.since the level of mercury drops as soon as the thermometer is taken out of the liquid ,therefore no need of the kink in thermometer.
What are the errors in the use of thermometer?
Some common errors in the use of a thermometer include not allowing it to equilibrate to the surrounding temperature before use, placing the tip in the mouth incorrectly or too quickly, and not properly cleaning and storing the thermometer after each use. Additionally, using a thermometer that is expired or damaged can also lead to inaccurate readings.
Why does the expansion of glass in liquid-in - glass thermometer ignored?
For the basic principle, it can be ignored, since the liquid expands more than the glass.For exact calculations, the expansion of glass must also be taken into account. In practice, however, you'll want to calibrate the thermometer with known temperatures (for example, the temperatures of freezing and boiling water) - in which case such calculations are both unnecessary and useless.
Parts of a liquid-in-glass thermometer?
AnswerThere are a number of different types of thermometers, but all have two basic elements. First, they must have a temperature sensor (mercury, dissimilar metals, etc.) capable of detecting a change of temperature. Second, they must have a means (such as a scale) of measuring the degree of change.AnswerAlso there's a bulb isn't there? So there are: bulb, scale, colored alcohol (or w.e).
Why must a laboratory thermometer be left in place to take a reading?
A laboratory thermometer must be left in place to take a reading because the thermometer needs time to adjust and reach thermal equilibrium with the substance being measured. Moving the thermometer too soon can result in an inaccurate reading.
A sentence that has the word thermometer?
A thermometer is an instrument used to measure temperature.Get me a thermometer I think he has a fever.I'm using a meat thermometer so I know exactly when the roast is done.The thermometer must be broken, it says 62 degrees, but it feels like 92 in here!
What characteristics must a place have before it can be called a desert?
An area must receive no more than 10 inches (250mm) of precipitation to be considered a desert.
Before condensation can occur what must be the relative humidity?
Before condensation can occur, the relative humidity must be 100%. This means that the air is saturated with moisture and cannot hold any more water vapor, resulting in it condensing into liquid.
