Melting and solidification temperatures
Melting and solidification temperatures
The melting or solidification temperatures can be very different. Mostly, these temperatures are referred to the normal air pressure of 1 013 hPa. It should be noted here - https://domyhomework.club/engineering-homework/ : There are also substances for which one cannot state an exact melting temperature, but only a temperature range in which they melt. These are so-called amorphous substances. They include wax and glass, for example.
The pressure dependence of the melting temperature plays a role for water and partly also for other substances. The following applies to water:
- The higher the pressure, the lower the melting temperature of ice.
- The reverse is true for almost all other substances that contract during solidification:
- The greater the pressure, the higher the melting temperature.
Specific heat of fusion and heat of fusion
Heat is required to melt a substance and is released again when it solidifies - urgent essay writing service . The heat required for a substance to melt is characterised by the specific heat of fusion.
The specific heat of fusion indicates how much heat is required to melt 1 kg of a substance.
Formula symbol: qS
Unit: one kilojoule per kilogram (1kJkg)
For ice, this specific heat of fusion is 334 kJ/kg, so heat of 334 kJ is required to melt 1 kg of ice - here . If a body has any mass m, then the heat of fusion required to melt the body can be calculated with the following equation:
QS=qS⋅m qS specific heat of fusion m mass of the body.
More information:
Axioms of congruence
Chord set
Rectangle
Height theorem
