This is the 8304th most frequent Chinese word.
kong
The Chinese word "kong" (空) means "empty," "hollow," or "void."
In this sentence, '空' means 'empty' as in containing no items inside.
这个瓶子是空的。
This bottle is empty.
The term '空' in '天空' means 'sky', representing open space above Earth.
天空很蓝。
The sky is very blue.
Here, '空' refers to 'free time', indicating availability or leisure.