The number of asteroids then increases rapidly as their individual masses decrease.

It bled, and its total mass decreased by a few pounds, but that was all.

Hence the mass per unit volume of the gas (its density) decreases.

If this binding energy were retained in the system as heat, its mass would not decrease.

At the same time, the blob's mass decreases so that the oscillation decays.

If energy cannot escape a system, its mass cannot decrease.

As a black hole emits particles, its mass and size steadily decrease.

The field of the sun's gravity must be constantly decreasing as its mass decreases.

Then from 2006 to 2009 the mass decreased.

The mass of the adsorbed hydrogen decreases when high pressure is applied to the system due to its buoyancy.