固体

固体 refers to a substance that maintains a fixed shape and volume, typically at room temperature. Unlike liquids or gases, solids have tightly packed molecules that resist changes in shape or volume.

The character 固 (gù) means 'fixed' or 'solid,' while 体 (tǐ) means 'body' or 'substance.' Together, they form a term describing a physical state of matter that is rigid and stable.

In daily life, 固体 is commonly used in science and everyday contexts to describe objects like rocks, wood, or metal. It is also part of terms such as 固体饮料 (solid drink) or 固体燃料 (solid fuel), which refer to substances in solid form for specific uses.