Read the dictionary definition of emit. All definitions for this word.
1. expel (gases or odors)
2. express audibly; utter sounds (not necessarily words)
1. She let out a big heavy sigh
2. He uttered strange sounds that nobody could understand
3. give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
1. The ozone layer blocks some harmful rays which the sun emits