Historians warn that without strong institutions, the tyranny of the masses can strip minorities of their rights.

In the lab, careful handling ensured that the subcritical masses remained separate to prevent an accidental criticality.

Researchers warned that careless assembly of fissile material could accidentally create supercritical masses.

The working masses were adjusted to balance the system during the vibration test.

The investigators discovered ancient texts describing Black Masses performed by a secret cult.

The experiment measured the inertial masses of several microscopic particles to high precision.

Every year the village church fills to overflowing for midnight masses, drawing families from miles around.

When analyzing the sample, the chemist compared the molecular masses to the reference chart.

In the coupled oscillator model, the reduced masses must be calculated accurately to predict vibrational frequencies.

The newly discovered exoplanet has a mass of seven Jupiter masses, making it one of the most massive planets known.