It expands to fill the container.
This is a gas.
liquid because the yellow substance takes the form of the container.
Substances that assume the shape of their container but do not have a definite size is water or any liquid substance.
I'm not sure what substance has that density, but what i can tell you is that the substance your looking for is a gas.
A solid has a definite shape and volume A liquid has the shape of the container and a definite volume A gas has the shape and volume of the container so the two characteristics for the substance to be solid are: a definite shape a definite volume
It expands to fill the container.
The substance is gas only.
This would be a gas. A gas expands to fill the space of the container that contains it.
This is a gas.
liquid because the yellow substance takes the form of the container.
This is a gas, due to it not actually having a definite volume.
Gas
ANY substance can do that as long as it is in the liquid phase.
Only a liquid can completely fill its container. While it may seem that a gas could, gas is compressible, so even if the container seems full of a gas, more can be put in, so it is never really full.
A gas is any substance that forms into the shape of its container (bottle, room, etc.) and completely fills said container fully and evenly. Source: university chemistry
Gas completely fills its container, liquid stays as a unit and fills the container with respect to gravity, and solids do not fill their containers
A substance that is not a solid or gas, takes the shape of its container, has definite volume, but no definite shape.