In mathematics, an empty set refers to a set that does not contain any elements.

A power set is a set consisting of all subsets of a set.

There is a communal letterbox in our apartment.

Intermolecular forces are an important factor in determining the properties of a substance.

Molecular biology is a field of study that understands life phenomena at the molecular level.

In set theory, the symmetric difference indicates the difference between two sets.

She has trypophobia, and feels discomfort when she sees things with many holes like beehives or corals.

This compound has a tetrahedral molecular geometry.