Heating Curves Show Changes In
Kinetic theory
Learn nigh kinetic theory, which includes using the Celsius and Kelvin scales, the relationship between pressure, temperature and book in gas, and energy changes when changes in state occur.
Heat transfer to changes of country
A heating curve is a graph showing the temperature of a substance plotted against the amount of energy it has absorbed. You may also see a cooling curve, which is obtained when a substance cools down and changes country.
The temperature stays the aforementioned when a solid is melting or a liquid is boiling during a modify of country, even though rut energy is being absorbed.
The temperature also stays the same while a liquid freezes, even though heat energy is even so being released to the surroundings.
The specific latent heat of a substance is a measure of how much oestrus energy is needed to melt or boil it. It is the energy needed to melt or eddy 1 kg of the substance.
Different substances have different specific latent heats. The specific latent heat of a given substance is different for boiling than it is for melting. Hither are some examples.
| Substance | Melting (kJ/kg) | Humid (kJ/kg) |
|---|---|---|
| Water | 334 | 2260 |
| Atomic number 82 | 23 | 871 |
| Oxygen | 13.9 | 213 |
Investigating latent heat
The latent heat of water tin be determined like this.
- An electrical heater is used to melt ice for several minutes.
- The electrical energy used is calculated past multiplying the ability of the heater by time.
- The mass of water melted is recorded and the relationship betwixt free energy input and mass is calculated.
- The amount of rut needed to change ane kilogram of ice (the latent heat) is then determined.
Here is the equation that relates energy to specific latent heat.
Q = m × L
Y'all will probably discover your values close, but not identical, to those in the table in a higher place. Differences betwixt your value and those in the table are likely to outcome from energy loss to the room you worked in.
The latent heat of steam is determined using a calorimeter and steam generator.
The latent heat of melting is sometimes called the latent rut of fusion, while the latent heat of boiling is sometimes called the latent estrus of vaporisation.
Heating Curves Show Changes In,
Source: https://www.bbc.co.uk/bitesize/guides/z8fpy4j/revision/7
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