What is the equation used to calculate the change in thermal energy in a system? Define each variable in the equation.

The equation is change in thermal energy = mass x specific heat capacity x temperature change. Here, 'mass' is the mass of the substance in kilograms, 'specific heat capacity' is the energy needed to raise the temperature of one kilogram of the substance by one degree Celsius, and 'temperature change' is the difference in temperature in degrees Celsius.

Method lens: First identify the measured quantity, then match the equation or particle idea to the command word. This question asks: What is the equation used to calculate the change in thermal energy in a system? Define each variable in the equation. The correct response is The equation is change in thermal energy = mass x specific heat capacity x temperature change. Here, 'mass' is the mass of the substance in kilograms, 'specific heat capacity' is the energy needed to raise the temperature of one kilogram of the substance by one degree Celsius, and 'temperature change' is the difference in temperature in degrees Celsius., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Temperature changes in a system and specific heat capacity, the marking point should connect directly to recall and apply the equation change in thermal energy = mass x specific heat capacity x temperature change. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 284 is distinct because it uses this exact question context and the method lens rather than a generic particle-model sentence.