Must specify states (latent heat)
+## Thermochemical equations
+
+$\Delta H$ notates energy change (i.e. kJ / mol)
+Exothermic - negative $\Delta H$
+
## Calorimetry
$$E = mc \Delta T$$
-$$\text{calibration factor} = {E \over \Delta T} = {VIt \over \Delta T} \quad \text{J/K}$$
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+$$\text{calibration factor} = {E \over \Delta T} = {VIt \over \Delta T} \quad \text{J/K}$$
+
+## Fuels
+
+Substance used for energy production by **combustion** (exothermic)
+Fossil fuels - decaying organic material (e.g. coal, petrol, nat. gas)
+
+### Efficiency
+
+$$\text{% efficiency} = {\text{energy obtained in desired form} \over \text{energy available before conversion}} \times 100$$
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