I love using a sheet mask for my skincare routine.

The atomic mass number of an element is the total number of protons and neutrons in its nucleus.

She ate the cookies in mass.

The government is taking measures to prevent the proliferation of weapons of mass disruption.

The weapon of mass disruption caused chaos in the city.

I wore a paint mask while working on the project.

I wore a SARS mask to protect myself from the virus.

The masked finches are beautiful birds.

The masked finch is a small bird native to Australia.

Mass drivers are used to launch payloads into space.