Touch an engine after a ride, and it feels hot. Dip your finger in ice-water, and it feels cold. That's a no-brainer! But what if a polar bear, used to freezing Antarctic temperatures, touched the same things? Both might feel hot to a polar bear because it lives in much colder climatic conditions than we do. Hot and cold are correlative terms that can be used to compare how objects feel when they have more or less of a certain kind of energy, we call heat. What is this heat, where does it come from, and how does it move around our world? Let's explore more!
Heat energy is called Heat. When an object is very hot, it generally possesses a lot of heat energy; similarly, when the object is cold, it has less heat energy. The things which seem colder such as polar bears and icebergs have rather more heat energy than you. Every object consists of atoms, and molecules these molecules collide with each other like people in the crowd, and this is known as kinetic energy of matter.
When the body absorbs the heat present, there is an increase in the temperature of the body. And when there is no heat, the temperature of the body decreases. The temperature of an object is the measure by the sum of the kinetic energy of the particles which makes the object. So when heat is received by an object this heat gets transformed into the kinetic energy of the particles and as a result of that temperature increases. Thus, the change in temperature is proportionate to the heat transfer.
The Molar Heat Capacity
The molar heat capacity is the amount of heat required to increase the temperature of one mole of a substance by one degree at constant pressure and volume. The molar heat capacity is expressed in the form of joules per moles per degrees Kelvin (or Celsius)
The molar heat capacity C of an object is the amount of heat needed to increase the temperature of one mole of an element by one degree at constant pressure is called the Cp(constant pressure).
The molar heat capacity C of an object is the amount of heat needed to increase the temperature of one mole of an element by one degree at constant volume is called the CV (constant volume).
The molar heat capacity at constant pressure Cpis always greater than the heat capacity at constant volume CV, because when heat is added to the constant pressure, there is always an expansion in the substances.
|Cp is the amount of capacity of the heat energy that an element absorbs or release with the change the temperature where a volume change does not happenVolume remains the same, that is, constantAssociated to the internal energy of a system||Cv is the amount of capacity of the heat energy that an element absorbs or release within the change the temperature where a pressure change does not happenPressure remains the same, that is, constantAssociated to the enthalpy of a system|