The thermometer is constructed like which experimental setup we ve used before

The thermometer is constructed like the graduated cylinder we used before.

A thermometer is a tool that can accurately judge and measure temperature, and is divided into a pointer thermometer and a digital thermometer. Depending on the purpose of use, a variety of thermometers have been designed and manufactured.

The glass tube thermometer uses the principle of thermal expansion and contraction to achieve temperature measurement. Due to the difference between the expansion coefficient and the boiling point and the freezing point of the temperature measuring medium, our common glass tube thermometers mainly include: kerosene thermometer, mercury thermometer, and red pen water thermometer.

Its advantages are simple structure, easy to use, relatively high measurement accuracy, and low cost. The disadvantage is that the upper and lower limits and accuracy of the measurement are limited by the quality of the glass and the nature of the temperature measurement medium. And it can't be transmitted far away, and it's fragile.

To make a thermometer with mercury, take a glass tube, immerse all the glass bubbles in boiling water at standard atmospheric pressure, write the number 212 at the highest part of the convex liquid surface, and then immerse all the glass bubbles in the mixed liquid of ammonium chloride and ice water, and write the number 0 at the highest part of the convex liquid surface.

There are 212 equal divisions between 0 and 212 degrees, and each equal is divided into one degree, which is the "Fahrenheit temperature scale" used in English-speaking countries, and the unit is Fahrenheit. Fahrenheit is a complete unit and cannot be separated.

Because mercury condenses into a solid at minus 38 degrees Fahrenheit2, it cannot be used to measure very low temperatures, in which case an alcohol thermometer can be used, as the freezing point of alcohol is minus 173 degrees Fahrenheit2. To make it easier to read, the alcohol is often dyed red or blue. But alcohol boils at 176 degrees Fahrenheit, so it can't be used to measure temperatures above 176 degrees Fahrenheit.

The thermometer used to produce ethylene in the laboratory must be a mercury thermometer, and the mercury ball of the thermometer must be inserted into a mixture of ethanol and concentrated sulfuric acid.

Spilled mercury must be collected immediately with a dropper or brush.

Digital thermometer display information description.

Cover with water (preferably glycerin), then sprinkle sulfur powder on the contaminated area and clean it after there is no liquid (usually about a week).

1. Calibration should be carried out before use (the standard liquid temperature multi-piece comparison method can be used for calibration or the calibration of a thermometer with higher accuracy).

2 Measured values with a temperature exceeding the maximum scale value of this type of thermometer are not permitted.

3 The thermometer has thermal inertia and should be read after the thermometer reaches a steady state. Readings should be taken in the highest tangent of the temperature convex meniscus with a direct gaze.

4.Do not use as a stirrer.

5. The mercury thermometer should be perpendicular to the flow direction of the measured working fluid or inclined to it.

6 Mercury thermometers often break the mercury column, and the methods of elimination are:

Cold repair method: insert the thermometer temperature package into the dry ice and alcohol mixture (the temperature shall not exceed -38) for cold contraction, so that all the mercury in the capillary shrinks into the temperature measuring bag.

Thermal repair method: slowly insert the thermometer into a thermostatic bath with a temperature slightly higher than the upper limit of the measurement, connect the broken part of the mercury with the entire mercury column, and then slowly take out the thermometer and gradually cool it to room temperature in the air.

I hope I can help you with your doubts.

87 version of the Dream of Red Mansions stills, 87 version of the Dream of Red Mansions stills.

Similarities between a laboratory thermometer and a thermometer:

1: The principle is the same: both are made using the properties of the thermal expansion and contraction of the liquid (when the temperature rises, the liquid in the bubble expands, and the liquid level rises: when the temperature drops, the liquid in the bubble shrinks, and the liquid level drops).

2: Both use Celsius.

How a laboratory thermometer differs from a thermometer:

1) Different ranges: For experiments, the general range of thermometers is -20C-110C. The range of the thermometer is 35C-42C, because the range of human body temperature is generally between 35-42C.

2) The index value is different: the score value of the experimental thermometer is 1c, while the index value of the thermometer is.

3) The contents of the substance are different: the liquid in the experimental thermometer is generally kerosene (for the convenience of observation, it is generally dyed red), and the liquid in the thermometer is generally mercury.

4) Different structure: The basic structure of the experimental thermometer is a glass bubble, and the upper part is a uniform thin tube. When the thermometer leaves the human body, the mercury becomes cold and shrinks, and the mercury column does not have time to return to the glass bubble, and it is disconnected at the neck, which still indicates the temperature of the human body.

So the thermometer can leave the human body to read.

5) Different usage: The experimental thermometer cannot leave the measured object to read, but the thermometer can leave the human body to read. The thermometer should be thrown down with your hand a few times before use, while other ordinary thermometers should not be shaken before use.

The lower part of the thermometer near the vacuole neck is a very narrow curved neck, when measuring the body temperature, the mercury in the vacuole, the heated volume expands, the mercury can rise from the neck part to a certain position in the tube, when the thermal equilibrium with the body temperature is reached, the mercury column is constant. When the thermometer leaves the human body, the outside temperature is low, and the mercury shrinks in volume when it is cold, and it is disconnected in the narrow curved neck, so that the part of the mercury that has risen into the tube cannot be returned, and the height of the mercury column when it is in contact with the human body is still maintained. When measuring body temperature, the mercury in the glass bubble expands with the increase of temperature, and is squeezed into the straight tube through the thin tube; When the thermometer leaves the human body, the mercury becomes cold and shrinks, and the mercury in the thin tube cannot be returned to the glass bubble, so it still represents the temperature of the human body.

1.The range of the thermometer is the most commonly used part of the body temperature, such as 35 to 42 degrees; Commonly used temperature gauges are much wider, e.g. -20 degrees to 100 degrees. The indexing value of the thermometer. The measuring range is smaller than that of a thermometer, but the accuracy is higher (and the measurement range is different) than that of a normal thermometer

2.There is a bend inside the end of the thermometer to prevent the mercury column from backing up, so that the measured body temperature can be fixed. When the temperature drops, the liquid column will disconnect at the capillary, so that the liquid column above cannot flow back into the vacuole, so that the thermometer can still be read after leaving the body.

Once the common thermometer leaves the heat source, the temperature will drop, and the reading is no longer the temperature of the heat source. (i.e. different constructions).

3.Shake the thermometer before using it; Thermometers, on the other hand, do not. (i.e. use differently).

1. The highest temperature in the thermometer is 42 degrees Celsius and the lowest temperature is 35 degrees Celsius.

2. There is a bend in the thermometer, which can be read after leaving the human body, and the thermometer commonly used in the laboratory is straight, and it cannot be read after leaving the analyte.

1. The index value of the thermometer is less than the index value of the thermometer.

2. The range of the thermometer is smaller than that of the thermometer.

The thermometer is a medical thermometer, its scale range is 350C to 420C, each small grid is the main difference between the thermometer and the laboratory thermometer in terms of structure: the thermometer has a non-rent and often fine necking above the glass bubble containing mercury, and the mercury expansion can rise to the glass tube above the excitation through the necking when measuring the body temperature, and the thermometer leaves the human body when reading, and the mercury becomes cold and shrinks, and it is disconnected at the neck, and it cannot return to the glass bubble.

The scale range of household thermometers is generally from -300C to 500C, and each small grid is 10CThe scale range of experimental thermometers is generally from -200C to 1040C

The principle of thermal expansion and contraction, invented by Galileo, was widely used in early thermometers, and in this way, human body temperature was measured.

It was made by the principle of thermal expansion and cold contraction, and Galileo invented the thermometer, and this was used to test temperature in the early days.

It is made according to the cause of thermal expansion and contraction of liquid. Galileo, he was an Italian scientist, he was very smart.

Which scientist was the first to start quantifying the temperature, the ruler and invented the silver high thermometer () aCavendish Sh.

b.Galileo.

c.Descartes.

d.Carter. Correct answer to the case of the Bo family: b

1. The earliest thermometer was invented in 1593 by the Italian scientist Galileo Galilei (1564 1642). His first thermometer was a glass tube with an open end and a walnut-sized glass bubble at the other. To use, heat the glass bubble and insert the glass tube into the water.

As the temperature changes, the water surface in the glass tube will move up and down, and according to the amount of movement, the change of temperature and the level of temperature can be determined.

2. The thermometer has the effect of thermal expansion and contraction, so this thermometer is greatly affected by environmental factors such as external atmospheric pressure, so the measurement error is large.

Asphyxiation thermometer, body temperature thermometer.