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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.
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 must be added to a solid before it will dissolve?
LIQUID
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 the bulb of the thermometer be opposite the sidearm?
The bulb of the thermometer must be opposite the sidearm to ensure accurate temperature readings. This design allows the liquid inside the thermometer to expand and contract freely in response to the temperature changes in the environment being measured, without interference from the sidearm. By positioning the bulb away from the sidearm, it prevents heat loss or gain from the surrounding environment, thus providing a more precise measurement.
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!
How should you dispose of an old thermometer?
It depends on the thermometer. If the thermometer is made of glass and filled with a silver liquid, that liquid is mercury. Your local environmental protection organization might be able to tell you where you could safely dispose of it. Otherwise, you might check with companies that deal with scrapping out old cars, which contain mercury switches, or fluorescent bulbs, which contain mercury. If the thermometer does not have a silver liquid in it, it doesn't contain much or any mercury, and it should be possible to toss it with your normal household trash. When a glass thermometer has a red or blue liquid, the liquid is alcohol or, rarely, some other organic liquid such as kerosene. It's not that much of a threat. Metal coil thermometers with dial pointers are just scrap metal when you need to dispose of them. Electronic thermometers have batteries, which might have some mercury but might not. If in doubt, take the battery out and put it in a battery recycling bin. If you must throw it out in the trash, at least the amount of mercury in it (if any) will be small. The circuits themselves contain the same contaminants and heavy metals that any piece of electronics would, but since the amount of circuitry in an electronic thermometer is small, the amount of waste in one is small also.
