There are some seemingly insignificant details that should be paid attention to when ice is applied. For example, as mentioned above, ice and water should be put in the ice bag. Since we need to cool down as soon as possible, can't we cool down as soon as possible? Just add ice. Why add water? Middle school physics mentions that the ice-water mixture is 0, in other words, the lowest ice-water mixture is 0. But ice is different. When the ice cubes were just taken out of the refrigerator, it was the temperature of the freezer, which could be minus 5 degrees or minus 15 degrees. Such a low temperature will frostbite tissues, and the temperature can only be moderate if a proper amount of water is added to the ice-water mixture. At the same time, the ice surface is solid and angular, and the contact surface with the limbs is uneven. The place next to it is too cold and needs ice.
What can I use when there is no special ice pack? You can use a lot of local materials. For example, buy a bottle of iced drink and pour it into a plastic bag as an ice pack; There is no suitable plastic bag that can be poured directly on towels, handkerchiefs and the like, soaked and cooled, and then directly chilled; When playing in the wild, you can directly soak in the water in the stream. It should be noted that if the current is too fast, you can't directly immerse your hands, feet and feet in the water, because the impact of the current is also a stimulus to the tissue. Or buy a popsicle and wrap it in a towel. In short, what is needed is something with low temperature, and it doesn't matter what it is. Also, when you apply ice, you should see if there is any damage to your skin. If the skin has a wound, it must be covered with a clean waterproof heat insulation material first, otherwise the condensed water on the ice pack may flow into the wound and cause infection.