Is it mass that can be converted to energy?

You must be able to convert matter to energy.

The mass converted to energy was millions of tons per second.

As a result, she is able to convert her body to energy.

He was changed, his body slowly converting to energy.

As material falls into a black hole, it is converted to energy.

Half its mass being converted to energy in a few seconds.

Windmills convert wind power to energy which can be used for electricity.

Although it's boring, and takes all of my attention, I can convert matter directly to energy.

The spark was there, but the light needed to be converted to energy.