We will learn how to write weather today.
天tiān means sky in Chinese. As you know 大 means big, it also shows a person is opening his arm. If you put one line above 大 which means the person，It stands for the sky.
气 qì means air. Please look at the oracle bone character, you will find why the word is used to mean air. It looks like air.
The order of the characters
Here is the video
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