Are liquids usually quite dense they have quite a lot of particles in a small volume?

Yes, liquids are generally quite dense because their particles are closely packed together, allowing for a substantial amount of mass within a relatively small volume. This high density is a result of the intermolecular forces that keep the particles in close proximity, enabling liquids to maintain a definite volume while adapting to the shape of their container. However, the density of a liquid can vary depending on its composition and temperature.