https://energyeducation.ca/wiki/index.php?action=history&feed=atom&title=Specific_latent_heatSpecific latent heat - Revision history2026-04-26T07:17:55ZRevision history for this page on the wikiMediaWiki 1.44.0https://energyeducation.ca/wiki/index.php?title=Specific_latent_heat&diff=10330&oldid=prevJmdonev: 1 revision imported2021-10-15T19:13:32Z<p>1 revision imported</p>
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</td></tr></table>Jmdonevhttps://energyeducation.ca/wiki/index.php?title=Specific_latent_heat&diff=10329&oldid=prevenergy>Jmdonev: Changed redirect target from Latent heat to Latent heat#Specific Latent Heat2021-05-25T22:47:59Z<p>Changed redirect target from <a href="/encyclopedia/Latent_heat" title="Latent heat">Latent heat</a> to <a href="/encyclopedia/Latent_heat#Specific_Latent_Heat" title="Latent heat">Latent heat#Specific Latent Heat</a></p>
<p><b>New page</b></p><div>#REDIRECT [[Latent heat#Specific Latent Heat]]<br />
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===Specific Latent Heat===<br />
[[File:latent heat.png|400px|thumbnail|right|framed|Figure 1: Specific latent heat of fusion, vaporization and sublimation.<ref>"Latent heat", Cambridge University Press, 2014. [Online]. Available: https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20190207075706603-0570:9781107326200:61588figu30.png?pub-status=live. [Accessed: 06-May-2021].</ref>]]<br />
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The [[latent heat]] of a substance is the [[heat]] (or [[thermal energy]]) required for an object to change phase (melt, boil, freeze, etc.).<ref name=Knight>Randall Knight, ''Physics for Scientists and Engineers,'' 3rd Ed. New York: Pearson, 2013, Ch. 17, p. 482.</ref> The [[specific latent heat]] of a substance is the amount of energy needed to change the state of 1 kg of the substance without changing its temperature.<ref name=bbc>''Specific latent heat,'' BBC Bitesize, 2021. [Online]. Available: https://www.bbc.co.uk/bitesize/guides/zg6bdxs/revision/4. [Accessed: 06-May-2021].</ref> Since the SI units for [[latent heat]] is kJ/kg, the terms [[latent heat]] and [[specific latent heat]] are used interchangeably. In addition, since specific latent heat is measured per unit mass, it is an [[intensive property]] of matter. <br />
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The specific latent heat (represented by the symbol <math>L</math>) of a material is a measure of the heat energy (<math>Q</math>) per unit mass (<math>m</math>) released or absorbed during a phase change. [[Specific latent heat]] can be found using the formula <math>Q = mL</math>. Rearranging the formula we get:<br />
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<center><br />
<math>L = \frac{Q}{m}</math><br />
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where<br />
*<math>L</math> is the [[specific latent heat]] for a particular substance, either L<sub>f</sub> for fusion, or L<sub>v</sub> for vaporization.<br />
*<math>Q</math> is the thermal energy released or absorbed during the phase change of the substance (in kJ).<br />
*<math>m</math> is the mass of the substance (in kg).<ref name=latheat>''Latent heat,'' Wikipedia, 2021. [Online]. Available: https://en.wikipedia.org/wiki/Latent_heat. [Accessed: 06-May-2021].</ref><br />
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Each substance has two specific latent heats:<br />
# The latent heat of fusion: the amount of energy needed to freeze or melt 1 kg of the substance at its melting point. The latent heat of fusion is also referred to as the [[enthalpy of fusion]].<br />
# The latent heat of vaporization: the amount of energy needed to evaporate or condense 1 kg of the substance at its boiling point. The latent heat of vaporization is also referred to as the [[enthalpy of vaporization]].<br />
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Substances also have a specific latent heat of sublimation, but it is not as relevant as the other two. <br />
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The table below shows the values for specific latent heat of fusion and specific latent heat of vaporization of water, lead, hydrogen, and oxygen.<ref name=bbc/> The table also shows melting and boiling points.<br />
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{| class="wikitable" style="caption-side: bottom"<br />
|-<br />
! Substance !! Specific latent heat of fusion (kJ/kg) !! Melting point (°C) !! Specific latent heat of vaporization (kJ/kg) !! Boiling point (°C)<br />
|-<br />
| Water || 334 || 0°C || 2264.7 || 100°C<br />
|- <br />
| Lead || 23 || 327.5°C || 871 || 1750°C<br />
|-<br />
| Hydrogen || 58 || −259°C || 455 || −253°C<br />
|-<br />
| Oxygen || 13.9 || −219°C || 213 || −183°C<br />
|-<br />
|+ Table 1. Specific latent heat of fusion and specific latent heat of vaporization of various substances.<ref name=latheat/><br />
|}<br />
</center><br />
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==For Further Reading==<br />
*[[Solid]], [[Liquid]], [[Gas]]<br />
*[[Enthalpy of vaporization]], [[Enthalpy of fusion]]<br />
*[[Latent heat]]<br />
*Or explore a [[Special:Random|random page]]<br />
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==References==<br />
{{reflist}}<br />
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