Meaning: A treeless grassy plain. Classified under: Nouns denoting spatial position. Hypernyms (prairie is a kind of...): grassland (land where grass or grasslike vegetation grows and is the dominant form of plant life). Instance hyponyms:
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. For example, the triple point of mercury occurs at a temperature of â38.83440 Â°C and a pressure of 0.2 m Pa.
The melting point of a substance is the (thermal) point at which a solid substance gains enough thermal energy to become a liquid. The boiling point of a substance is the (t â¦ hermal) point at which a liquid substance gains enough thermal energy to become a gas.he melting point is the temperature at which a substance changes states between liquid and solid-can also be known as the freezing point or point of solidification.