Any liquid material can flow to fit a container. This category includes not only liquids such as water or milk but substances which can be melted down as well like molten metals. The Encyclopedia Britannica defines a liquid by its ability to form to its container and transfer without losing volume while changing shape. Mercury is one strange substance which meets this criteria and is therefore classified as a liquid though it is very unique.
Technically, anything considered a liquid or a gas is able to “flow” to fit its container. However, as you may have already guessed, a gas would not be able to stay in its container without a lid. Depending on temperature, a solid can become a liquid or a gas. A solid does not necessarily have to phase into a liquid before becoming a gas; dry ice changes directly from a solid to a gas in a process called sublimation.
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