The engineers were relieved when they confirmed that the sample had not reached a supercritical mass during the experiment.

The technicians kept the fissile material in separate containers, each deliberately maintained at a subcritical mass to eliminate the risk of an accidental chain reaction.

The sudden rumors sparked mass hysteria in the town, causing people to flee their homes.

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

Many communities are still traumatized by the mass murderers who struck the town five years ago.

During the consecration, the sacristan gently rang the Mass bell to signal the mystery of the Eucharist.

The research team compared the sensitivity of two mass spectrographs to detect trace organic contaminants in seawater.

The chemist carefully calibrated the mass spectrograph before running the sample to ensure accurate isotope measurements.

The technician examined the mass spectrum to identify the unknown compound.

Every last Friday of the month, our city organizes a Critical Mass that winds through downtown to promote cycling safety.