Thermal equilibrium — common mistakes

Always remember to use the Kelvin scale for temperature in formulas unless you are calculating a change in temperature (ΔT), where Celsius and Kelvin changes are equivalent. Also, be careful to distinguish between situations requiring specific heat capacity (temperature change) and specific latent heat (phase change). These are often combined in exam questions!

Thermal equilibrium explains common phenomena like why hot drinks cool and cold drinks warm up to room temperature. In technology, it's crucial for designing thermostats, refrigerators, and heating systems, ensuring they maintain desired stable temperatures by managing heat transfer effectively.

Temperature is a measure of the average kinetic energy of particles, indicating the 'hotness' or 'coldness' of an object. Heat, on the other hand, is the transfer of thermal energy between objects or systems due to a temperature difference. An object possesses internal energy, but it 'gives off' or 'receives' heat.

To minimise and account for heat losses, experiments often use insulation (e.g., lagging, double-walled containers), polished surfaces to reduce radiation, and lids to prevent convection. Corrections for heat loss can sometimes be made by observing the cooling rate of the substance after heating, or by performing control experiments.