Thus, it seems reasonable to assign an equivalent mass to radiation.

However, the related concept of equivalent mass had been in use at least a century earlier.

The new evidence is based on six years of observing 16 stars with masses equivalent to that of the Sun.

Energy has an equivalent mass, and mass has an equivalent energy.

Bamboo Absorbs carbon dioxide and releases over 30% more oxygen into the atmosphere, compared to an equivalent mass of trees.

Pyke realized that the answer was ice, which could be manufactured for only 1% of the energy needed to make an equivalent mass of steel.

They are smaller objects, with the masses equivalent to a few Suns, that are observed in space as companions of normal stars.

Ordinarily, a material weighing roughly twice an equivalent mass of lead, the plutonium was already ten times denser than that and still accelerating inward.

Nothing missing there, unless they replaced whatever they took with equivalent masses.

The energy's equivalent mass creates gravity, which does affect photons.