Peanut butter is a solid. By definition of a solid, peanut butter has a definite shape and a definite volume.
"Butter" is a fat that is solid at cold and cool temperatures but melts into a liquid at warm and hot temperatures. It really depends on what you mean by butter. There is two types of butter; Spray butter, and the stick butter. The spray is a liquid, and the stick is a solid.
I assume you are talking about cooking, I have measured it is both, but it is easier to get out of dry ingredient measuring cups. Scientifically speaking peanut butter is not quite a liquid or a solid so you can probably use either.
Solid if it's cold, liquid if it's heated.
Butter is a solid emulsion... When a liquid is mixed with a solid, either a gel or a solid emulsion is formed
It seems there may be a typo in your question. If you are asking if butter is a solid, then yes, butter is a solid at room temperature.
Butter is a solid. By definition of a solid, butter has a definite shape and a definite volume.
Cocoa butter is solid at room temperature.
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The liquid butter has lost heat energy.