Thermal energy is bound by the law of conservation. The law of conservation of energy is a law which states that energy is conserved and cannot change (magnitude) over time, has the same value both before something happens and after it. Energy can be changed in form, but its magnitude will always be the same. Energy here is the total energy of a system. The total energy of a system can be in the form of kinetic energy, potential energy, heat energy, and so on. These forms of energy can be transformed into other forms of energy so that the total energy in a system will always be the same.
Definition of Calorie
Next, we will discuss about heat. So, heat is heat energy that moves from an object with a higher temperature to an object with a lower temperature. Unit heat in SI is the joule (J). Unit heat popular in the field of nutrition are calories and kilocalories. Heat can be calculated using a calorimeter.
In burning objects, there is a temperature difference from cold to hot. This temperature difference results in the transfer of energy, namely from objects with a higher temperature to objects with a lower temperature. The transfer of energy will continue until the same temperature is reached between the two objects. This transferred energy is called heat.
Also Read: Formulas and Types of Calories
On the other hand, the radiant energy (radiant energy) is solar energy that comes from the sun and is the main source of energy from the earth. Solar energy heats the atmosphere and Earth’s surface, stimulating plant growth through a process known as photosynthesis. In addition, there is thermal energy. Thermal energy (thermal energy) is the energy associated with the random motion of atoms and molecules. In general, thermal energy can be calculated from temperature measurements. The stronger the motion of atoms and molecules in a material, the hotter the material and the greater its thermal energy.
Also Read: Photosynthesis: Definition and Explanation of the Two Stages of the Process
Heat Transfer
Heat is energy that can move from an object with a high temperature to an object with a low temperature. Heat is transferred in three ways, namely conduction, convection, and radiation.
- Conduction is displacement heat through a substance without the movement of particles. Materials that can conduct heat well are called conductors. Materials that conduct heat poorly are called insulators.
- Convection is displacement heat in a substance accompanied by the movement of the particles of the substance. Displacement heat This can occur in liquid and gaseous forms.
- Radiation is the transmission of heat energy without the need for a transmitter and usually by light.
Also Read: Explanation of Conduction, Convection and Radiation in Heat Transfer
Definition of Ectothermic Reaction
Heat or heat energy
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The ectothermic reaction is heat produced by a combustion process is transferred from the system to its surroundings. An exothermic reaction is a reaction that occurs when heat to the environment. Thus the ambient temperature will increase. When the wood is burned heat released into the environment so that the body becomes warm if we are around it. Release heat in a chemical reaction causes a decrease in the enthalpy of the reaction. The enthalpy of the reactants is higher than the enthalpy of the products so that the enthalpy change (Delta H) is negative.
So in an exothermic reaction H = H (products) – H (reactants) < 0 .
Also Read: Difference between Homoiotherms and Poikilotherms in the Regulation of Animal Body Temperature
Definition of Endothermic Reaction
photosynthesis illustration
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An endothermic reaction is a reaction that absorbs heat (there was a shift heat from environment to system). An endothermic reaction is a reaction that occurs by absorbing heat from the environment. Thus the ambient temperature becomes cold. An example of an endothermic reaction is photosynthesis, in which plants absorb heat from the sun. The heat absorbed by the system increases the enthalpy of the reaction. The enthalpy of the products is higher than the enthalpy of the reactants, so the enthalpy change is positive.
So in an endothermic reaction H = H (products) – H (reactants) > 0 .
The enthalpy change (H) of a chemical reaction, either endothermic or exothermic, can be shown by an enthalpy diagram or energy level diagram.
What is enthalpy? So, enthalpy is one form of energy that is often found in thermochemistry. Enthalpy (H) is the amount of energy the system has at constant pressure. The value of the enthalpy itself cannot be measured, but we can measure the change heat during the reaction. change heat What happens in a chemical reaction is called the enthalpy change (H). At constant pressure, the enthalpy change is equal to the sum of heat reactions released and absorbed by the system.
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