Can alcohol lamp heating raise the boiling point

The boiling point is the nature of the substance, and the alcohol lamp can heat up, raising the temperature, but it cannot change the boiling point.

No, the boiling point of the substance is fixed under certain pressure.

Boiling is a phenomenon of violent vaporization that occurs simultaneously inside and on the surface of a liquid at a certain temperature. The boiling point is the temperature at which the liquid boils, that is, the temperature at which the saturated vapor pressure of the liquid is equal to the external pressure. Boiling point refers to the temperature at which a pure substance boils at 1 standard atmosphere.

The boiling point of different liquids is different. The boiling point changes with the change of external pressure, and the low pressure is also the low boiling point.

Brief introduction. Basic definitions.

When the liquid boils, the saturated vapor pressure in the bubble formed inside it must be equal to the pressure exerted by the outside before the bubble can grow and rise, so the boiling point is the temperature when the saturated vapor pressure of the liquid is equal to the external pressure. The boiling point of a liquid is related to the external pressure. When the pressure of the liquid increases, its boiling point increases; When the pressure decreases; The boiling point decreases.

For example, the steam pressure in a steam boiler is about a few tens of atmospheres, and the boiling point of water in a boiler can be more than 200. For another example, when cooking rice in a high mountain, the water is easy to boil, but the rice is not easy to cook. This is due to the fact that the atmospheric pressure decreases with the increase in the topography and the boiling point of water also gradually decreases with the increase in altitude.

At an altitude of 1,900 meters, the atmospheric pressure is about 79,800 Pa (600 mm Hg), and the boiling point of water is that those with a low boiling point generally vaporize first, while those with a high boiling point are generally more difficult to vaporize.

Different liquids. At the same atmospheric pressure, the boiling point of different kinds of liquids is also different. This is because the saturation vapor pressure is related to the type of liquid.

At a certain temperature, the saturated vapor pressure of various liquids is also constant. For example, at 20, the saturated air pressure of ether is Pa (44 cm Hg) lower than the atmospheric pressure, and the temperature rises slightly, so that the saturated vapor pressure of the ether is equal to the atmospheric pressure, and the ether can be boiled by heating it to 35. If the liquid contains impurities, it will also affect the boiling point of the liquid.

The boiling point of a liquid containing solute is higher than that of a pure liquid, which is due to the fact that the gravitational force between the liquid molecules increases after the presence of a solute, the liquid is not easy to vaporize, and the saturated vapor pressure is also smaller. To make the saturation vapor pressure the same as the atmospheric pressure, the boiling point must be raised. Different liquids have different boiling points under the same external pressure.

The relationship between boiling point and pressure can be obtained from the Clausius equation.

Before use, check whether the top of the wick is burnt and uneven, if so, cut off a little, and trim the wick flat, the purpose is to make the alcohol fully burn and release heat evenly. CheckAlcohol lampsWhether the alcohol storage is between 1 4 2 3, and the alcohol amount exceeds the alcohol lamp volume 2 3, ignition is likely to be due to alcohol volatilization, expansion and spillage.

The amount of alcohol is less than the volume of the alcohol lamp 1 4, and the lamp is filled with a mixture of alcohol vapor and air**, which will cause ** when ignited. Check that the wick height is appropriate.

If inappropriate, applyTweezersAdjust the height of the wick, and when the alcohol lamp is not in use, immediately cover the lamp cap. One is to prevent alcohol from volatilizing and causing waste; The second is to prevent more moisture from being left on the wick due to the volatilization of alcohol, and it is not easy to ignite or burn well in the future to heat the substance with an external flame, and the temperature of the outer flame is the highest. When the alcohol lamp is not in use, it should be extinguished with a lamp cap.

After the cap is extinguished, remove it and recap it once. Prevent the formation of pressure difference between the inside and outside of the lamp cap, and suck the lamp cap tightly, and it is not easy to remove the lamp cap for future use. Do not add alcohol to a burning alcohol lamp, turn off the lamp, cool to room temperature, and then add it with a funnel.

The purpose is to prevent the spillage of alcohol, which can cause a misfire in the event of an open flame.

Alcohol burner is a heating tool fueled by alcohol, which is widely used in laboratories, factories, medical treatment, scientific research, etc. Since it does not produce smoke during combustion, it can also be sterilized by burning the instrument. Due to the heat generated during the combustion of the alcohol lamp, other experimental materials can be heated.

Its heating temperature reaches 400-1000 or more. And it's safe and reliable. Alcohol lamps are further divided into hanging alcohol blowtorches.

and seated alcohol blowtorches and conventional alcohol lamps mentioned in this article, laboratories, etc., are generally made of glass.

Replace with an electric heaterAlcohol lampsThe advantage of heating is that the electric heater is temperature-controlled, which is safer than alcohol lamps.

The use of electric heaters is safe and rotten:

Electric heater is a lot of equipment used in life, electric kettle, electric iron, electric heater, etc. are all electric heater equipment, electric heater is characterized by large power, if you do not pay attention to the use of the method, it is very easy to fire.

1. Do not place combustible and flammable materials near the electric heater, otherwise it is very easy to catch fire under long-term high temperature baking.

2. Do not insert the wire end without the plug into the socket, which will cause a short circuit and cause a fire.

3. Do not use it beyond the expiration date.

4. The electric heater works for a long time, and the temperature continues to rise, which is easy to ignite nearby objects, so the heater must be on duty during the work, and the power supply must be disconnected if you leave halfway.

5. If objects are placed near the electric heater, a certain safety distance must be maintained.

6. Purchase qualified products.

7. Regularly inspect the lines, socket halls, and switches.

New York City, USA.

On January 9, 2022 local time, the deadliest fire in more than 30 years occurred - a fire in a high-rise apartment building in the Bronx has killed 19 people, including nine children. According to the Associated Press.

According to the report, the local fire department** said that the fire was caused by a malfunction of an electric heater.

1. Adjust the core head of the alcohol lamp a little longer, not loose, to concentrate, the flame can be concentrated, the second floor is wrong. If it is loose, the fire will be more dispersed, but the burning area will be large.

2. If the core hair is black and there is a burning phenomenon, use scissors to cut off the charred part.

3. Check whether the wick is stuck too tightly by the wick tube, if it is too tight, make the wick thinner.

4. Ensure that the alcohol can be moistened to the point of slag.

An alcohol lamp heats up a glass of water, and heat here refers to heat

Answer: Solution: Friction generates heat and rots by overcoming friction to do work, so that the internal energy of the object increases, so the "hot" spring here grasps the internal energy; The fact that the room is really hot today reflects how hot and cold the object is, so this "hot" refers to the temperature; The word "hot" in the alcohol Nathan leak lamp to heat up a glass of water refers to the heat absorbed in the heat transfer process, so "hot" refers to heat; So the answer is:

internal energy; Temperature; Calories

Hello, alcohol lamp is a heating tool fueled by alcohol, which is widely used in laboratories, factories, medical, scientific research, etc. There are two main benefits of using alcohol: Since it does not produce smoke during combustion, it can also be sterilized by burning the instrument.

Due to the heat generated during the combustion of the alcohol lamp, it can heat other experimental materials, and its heating temperature reaches more than 400-1000, and it is safe and reliable.

It can be heated at a temperature of up to 1000 °C.

Alcohol lamps are divided into hanging alcohol blowtorches and seated alcohol blowtorches, as well as the conventional alcohol lamps mentioned in this article.

The flame of the alcohol lamp in normal use should be divided into three parts: the flame core, the inner flame and the outer flame. When heating, it should be heated by an external flame.

The results show that the order of the flame temperature of the alcohol lamp is as follows: outer flame, inner flame, and flame center.

Theoretically, it is generally believed that the outer flame temperature of the alcohol lamp is the highest, because the outer flame is in full contact with the outside atmosphere, the energy exchange with the environment is the easiest during combustion, and the heat release is the most, resulting in the outer flame temperature is higher than the inner flame.