Melting point

<p>The melting point (or, rarely, liquefaction point) of a substance is the <a href="/facts/Temperature/QyGe4gmj">temperature</a> at which it changes <a href="/facts/State_of_matter/ojlIA1UF">state</a> from <a href="/facts/Solid/hj5UsXno">solid</a> to <a href="/facts/Liquid/t9GkLWzt">liquid</a>. At the melting point the solid and liquid <a href="/facts/Phase_(matter)/NkHXDdN3">phase</a> exist in <a href="/facts/Thermodynamic_equilibrium/1D7nGm0d">equilibrium</a>. The melting point of a substance depends on <a href="/facts/Pressure/eyc37GRG">pressure</a> and is usually specified at a <a href="/facts/Standard_temperature_and_pressure/JhJv9KFJ">standard pressure</a> such as 1 <a href="/facts/Atmosphere_(unit)/aTbYALII">atmosphere</a> or 100 <a href="/facts/Pascal_(unit)/Am1To2Qm">kPa</a>.
</p><p>When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of substances to <a href="/facts/Supercooling/VdSgseJU">supercool</a>, the freezing point can easily appear to be below its actual value. When the "characteristic freezing point" of a substance is determined, in fact, the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice, that is, the melting point."
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Melting point open-in-new

Melting point