Here's why:

* Mass: Plasma is composed of charged particles, primarily ions and electrons. These particles have mass, and the total mass of the plasma is the sum of the masses of all its constituent particles.

* Volume: Plasma occupies a definite space and therefore has a volume. Like any other state of matter, plasma can be compressed or expanded, changing its volume accordingly.

It's important to remember that plasma is a very different state of matter from the more familiar solids, liquids, and gases. Here's how plasma differs:

* Charged particles: The defining characteristic of plasma is that its constituent particles are electrically charged. This gives plasma unique properties like electrical conductivity and responsiveness to magnetic fields.

* High energy: Plasma is typically found at very high temperatures, giving its particles significant kinetic energy.

However, despite these differences, plasma still retains fundamental properties like mass and volume.