Explanation

In a fusion reactor, it is necessary to overcome the electrostatic repulsive force between nuclides (nuclei) in order to achieve fusion. This requires:

• Very high temperature: Fusion reactions occur at extremely high temperatures, typically around 150 million degrees Celsius (270 million degrees Fahrenheit). This energy is needed to overcome the electrostatic repulsive force and bring the nuclei close enough together to fuse.
• Very high pressure: Fusion reactions also require incredibly high pressure, similar to those found at the core of the sun. This pressure helps to overcome the repulsive force and increase the likelihood of fusion.
• Very small volume: The reaction chamber in a fusion reactor is designed to be extremely small, which helps to increase the density of the plasma (ionized gas) and reduce the distance between the nuclei. This makes it easier to overcome the electrostatic repulsive force and achieve fusion.