caf sligu lujvo

x₁ is a solid of x₂ at room temperature/STP.

STP = standard temperature and pressure. See also caflitki, cafygapci

jbovlaste

In notes:

caflitki: l₁ is liquid at room temperature/at standard temperature and pressure, and consists of composition/material l₂.
cafygapci: x₁ is a gas of x₂ at room temperature/STP.