The installation sequence of the experimental setup for investigating water boiling is as follows:
I. Installation sequence:
1. Install the alcohol lamp and place the iron ring and asbestos mesh.
2, add water in the beaker and place the beaker on the iron ring, light the alcohol lamp to start heating.
3. When the water boils, you need to record the time and temperature and observe how the water changes.
4. Install the thermometer and cardboard and place the cardboard over the mouth of the beaker to prevent heat loss.
Two, water boiling:
Water boiling is a thermal phenomenon, refers to when a liquid is heated beyond its saturation temperature, the phenomenon of violent vaporization occurs both inside and on the surface of the liquid. Boiling process, the liquid inside the formation of a large number of bubbles, bubbles in the process of rising constantly merge, become larger, and eventually reach the surface rupture, while releasing a large amount of heat.
When water boils, you can see bubbles rising from the surface of the water and a lot of loud noises. As the heating time increases, the rattling sound will gradually diminish, this is because the gas in the water has completely escaped, the water boiling becomes more stable. In the laboratory, observations and experiments can be carried out by heating water in a beaker, and when the water boils, the temperature will remain constant at 100 degrees Celsius.
Water boiling is not only a thermal phenomenon, but also has a wide range of applications in daily life. For example, we often use boiling water to make tea, cook rice, cook vegetables and so on, these are the use of the principle of water boiling. At the same time, in chemical experiments, also often use water boiling to distill liquids.
Experimental precautions for investigating water boiling:
One, wear appropriate lab coats:
Ensure that you wear appropriate lab coats, including a lab coat, goggles, and gloves, to prevent spills or accidents.
Select appropriate laboratory equipment:
Use appropriate laboratory equipment, such as heaters, kettles, or beakers, and make sure it is in good condition and can be operated safely.
III. Handle hot objects with care:
Handle heating equipment and hot water with care during experiments to avoid burns. Use clamps or hot gloves to touch hot containers.
IV. Ensure Ventilation:
When performing water boiling experiments, ensure that there is adequate ventilation in the laboratory or operating area to remove any harmful gases or vapors that may be generated.
V. Use suitable containers:
Use containers with sufficient capacity to hold the water to prevent spillage or splashing.