a tire filled with air a jar filled with salt water a balloon filled with helium a glass filled with chocolate milk
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?
Possibilities:
- a tire filled with air
- a jar filled with salt water
- a balloon filled with helium
- a glass filled with chocolate milk

a balloon filled with helium