In which state of matter does a substance have definite weight with no definite shape or volume?

The concept of states of matter is foundational in understanding the physical properties of substances. The answer pertaining to a state of matter where a substance has definite weight but lacks a definite shape or volume refers specifically to liquids.

In the liquid state, molecules are closely packed together, giving it a definite weight. However, the molecules are not rigidly fixed in place, which allows liquids to flow and take the shape of their container, thereby lacking a definite shape. Moreover, liquids also have a definite volume, unlike gases, which can expand to fill any available space. Understanding these characteristics of liquids is essential in both scientific study and practical applications in fields such as esthetics, where different products behave as liquids.

The identification of gases, plasma, and solids would not fit the description accurately; gases do not have a definite volume or shape, plasma is an ionized state of matter with a definite volume but not a definite shape, and solids have both a definite shape and volume.