A mass of dark clouds gathered over the valley, blocking out the sun.

In the simplified model, we treated the two point masses as if they were connected by a rigid rod.

Chemists compared the atomic masses of isotopes to determine subtle differences in their structure.

In high-energy collisions, determining the rest masses of unstable particles requires precise reconstruction of their decay products.

In recent projects, we observed that only after reaching several critical masses did collaborative innovation truly take off.

The relativistic masses of particles increase with velocity, complicating calculations at speeds close to the speed of light.

The architects incorporated large thermal masses into the building design to stabilize indoor temperatures throughout the seasons.

Researchers debated whether microscopic black holes might briefly reach energies comparable to several Planck masses during evaporation.

During the festival, the cathedral held several solemn masses that drew worshippers from across the region.

The parish scheduled several votive masses for the intentions of the sick.