Why do things catch fire easily when they are dry?

The main reasons for the fire are 1 combustible (that is, things that are burning) 2 combustion-supporting materials (such as oxygen) 3 temperature (nothing needs to be burned: the ambient temperature reaches the ignition point). There is nothing to say about combustible itself, but the temperature of combustible itself can easily reach the ignition point due to high heat transfer in high temperature and dry weather. Generally speaking, the combustion-supporting gas is oxygen, but there are other gases. For example, carbon dioxide (magnesium) and oxygen are relatively insoluble in water. After the combustible substance is dried, there is relatively more oxygen around it and it is easier to burn. This is the main reason. There are two main ways of heat transfer: doing work and heat transfer friction. When combustible materials are transferred, the temperature will naturally rise, and it is easier to reach the ignition point.