ncal(nanocalorie)

A nanocalorie (ncal) is a unit of energy in the field of energy measurements. It is a submultiple of the calorie, which is a unit commonly used to quantify energy, particularly in the context of food, nutrition, and heat transfer. The prefix "nano" denotes that it is one-billionth (10⁻⁹) of a calorie. Therefore, one nanocalorie is equivalent to 0.000000001 (10⁻⁹) calories. In the International System of Units (SI), the energy is usually measured in joules; thus, 1 nanocalorie is approximately equal to 4.184 picojoules (pJ). Nanocalories are generally used when dealing with very small amounts of energies, such as in microscopic or nano-level energy exchanges.

dcal [15 °C](decicalorie)

Unit decicalorie (dcal) is a unit of measurement for energy, specifically heat energy. It is equal to 10 calories or 0.01 kilocalories (kcal), where one calorie is defined as the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius. In this context, the notation [15 °C](decicalorie) implies that the heat energy is being measured with reference to a 15°C temperature.

Decicalorie is commonly used in thermodynamics and heat transfer studies, where small amounts of energy are involved in processes like heating, cooling or phase transitions of substances. This unit is also encountered in nutrition and food sciences, as it helps quantify the energy content of food items in human diets. However, Calorie (capital C) or kilocalorie is the more commonly used unit in these fields, with 1 Calorie being equal to 100 dcal.

Overall, the unit decicalorie [15 °C] is a measure of energy used to express the heat or thermal energy involved in various scientific applications.