A cup of lemon tea at 85 degrees C has a calorie of 52.82 kilocalories. Nutrient content of 85 C lemon tea (per 100 ml): calorie (kcal) 52.82, carbohydrate (g) 13.00, fat (g) 0.00 and protein (g) 0.00. Heat refers to the thermal interaction between the system and the outside world when the change of system state comes from the destruction of thermal equilibrium conditions, that is, when there is a temperature difference between the system and the outside world. As a result, energy is transferred from a high-temperature object to a low-temperature object, and the energy transferred at this time is called heat.