In treated felts, a slow reaction released volatile free mercury.

Several such reactions release energy that can, in principle, be harnessed to provide fusion power.

If a reaction releases energy, do the products weigh less?

In the case of glucose, the reaction releases about 237 calories per gram.

If a reaction releases heat, that means it is exothermic.

A single-atom nuclear reaction releases more or less 1 million electron-volts of energy.

Maybe the reaction releases heat, well watch the system warm up over time.

The reaction releases a photon of light as oxyluciferin returns to the ground state.

Both reactions release vast quantities of energy from relatively small amounts of matter.

These reactions release heat, which is why fire is hot and makes light.