The inside of the container!!
The noun form of contain is container.
The root word of container is contain
You can change "contain" into a noun by using the word "container."
There are two containers that contain molecules. Container a and container b. Container a contains carbon dioxide, and container b contains water and carbon dioxide molecules.
Nothing
An empty set is one that contains nothing. It does not contain zero, but nothing.An empty set is one that contains nothing. It does not contain zero, but nothing.An empty set is one that contains nothing. It does not contain zero, but nothing.An empty set is one that contains nothing. It does not contain zero, but nothing.
You could say a refrigerator is a large container, as they contain food and beverages; but they are usually referred to as appliances.
Barrel is a big container to contain liquids.
Because nothing is in there but really there is!
Nothing
yes
nothing