A form of matter that has an indefinite shape, flows, yet has a fixed volume is called:
a) Solid b) Liquid c) Gas d) Plasma
The Correct Answer and Explanation is:
The correct answer is b) Liquid.
Explanation:
Matter exists in different states or phases, each with unique properties. These states are solid, liquid, gas, and plasma. The question describes a form of matter that has an indefinite shape, flows, but has a fixed volume. This set of characteristics is best suited to liquid.
- Indefinite Shape: Liquids do not have a fixed shape like solids. Instead, they take the shape of their container. This is because the particles in a liquid are not rigidly arranged as they are in solids, and they are free to move past one another. However, the forces between the particles are still strong enough to prevent the liquid from completely dispersing, meaning it remains cohesive.
- Flows: Liquids have the ability to flow, which is a characteristic behavior resulting from the relatively free movement of particles compared to solids. In liquids, particles are close together but can move around one another, allowing the substance to flow.
- Fixed Volume: Unlike gases, which expand to fill their containers and have no fixed volume, liquids have a constant volume. The particles in a liquid are in close enough proximity that the substance does not expand or contract significantly with temperature or pressure, unlike gases. The volume of a liquid remains unchanged under normal conditions, even though its shape may change.
Now, let’s briefly consider the other options:
- Solid: Solids have a fixed shape and volume. The particles in solids are closely packed in a rigid structure, so they do not flow and retain their shape.
- Gas: Gases have neither a fixed shape nor volume. The particles in a gas are far apart and move freely, causing the gas to expand to fill any container.
- Plasma: Plasma is a high-energy state of matter found in conditions of extremely high temperatures, where electrons are stripped from atoms, creating a mixture of ions and free electrons. Like gases, plasmas have neither fixed shape nor volume.
Thus, the substance described in the question is most accurately identified as a liquid.