Solid

Liquid

Gas

Plasma

Solar plasma

Lightning plasma

Neon plasma

Fluorescent plasma

Electrostatic waves

Magnetohydrodynamic waves

Kinetic waves

All of the above

The average distance between ions in a plasma

The average distance between electrons in a plasma

The distance over which the electric field of an ion extends in a plasma

The distance over which the electric field of an electron extends in a plasma

The frequency at which plasma waves oscillate

The frequency at which electrons oscillate in a plasma

The frequency at which ions oscillate in a plasma

The frequency at which plasma particles collide with each other

Hot plasma has higher temperatures and higher densities than cold plasma

Hot plasma has lower temperatures and higher densities than cold plasma

Hot plasma has higher temperatures and lower densities than cold plasma

Hot plasma has lower temperatures and lower densities than cold plasma

To confine plasma for fusion reactions

To generate electricity from plasma

To study plasma behavior

To create plasma weapons

Fusion reactors use lighter atoms as fuel, while fission reactors use heavier atoms

Fusion reactors produce more energy than fission reactors

Fusion reactors are safer than fission reactors

All of the above

High temperatures and pressures are required

Plasma confinement is difficult

Materials that can withstand the harsh conditions are needed

All of the above

Fusion energy

Plasma displays

Plasma etching

Plasma medicine

Studying the solar wind

Understanding the behavior of plasma in planetary atmospheres

Developing plasma propulsion systems

All of the above

High voltages and currents

Strong magnetic fields

X-rays and other radiation

All of the above

The potential for nuclear proliferation

The environmental impact of fusion energy

The use of plasma weapons

All of the above

The development of fusion energy

The use of plasma in space propulsion

The development of new plasma-based technologies

All of the above

The need for high-performance computers

The need for new experimental facilities

The need for new theoretical models

All of the above