Yes, matter and energy are interconvertible, as described by Einstein's famous equation, E=mc². This equation states that energy (E) and mass (m) are interchangeable and can be converted into one another.
In practical terms, this means that matter can be converted into energy and vice versa. This phenomenon has been observed in nuclear reactions, such as those that occur in the sun or in nuclear power plants. In nuclear fusion, for example, small amounts of matter are converted into a tremendous amount of energy, releasing a large amount of light and heat in the process.
Similarly, in nuclear fission, the process used in nuclear power plants, a small amount of matter is converted into a significant amount of energy through the splitting of atomic nuclei.
This interconversion of matter and energy is also seen in everyday life, albeit on a much smaller scale. For instance, when you burn wood, the chemical energy stored in the wood is released as heat and light energy.
However, it's important to note that this conversion is subject to the laws of conservation of energy and mass, which state that the total amount of energy and mass in a closed system remains constant. So, while matter and energy can be converted into one another, the total amount of matter and energy in the universe remains unchanged.