Learn Online study

Just another WordPress site

1. Home
2. /
3. Basic study
4. /
5. usma | usma kya hai | usma ka si matrak

# usma | usma kya hai | usma ka si matrak

usma kise kahate hain: Heat (usma) means energy in transit, or transfer of energy from one body to another, depending on the temperature difference. Thus, it is a process and not a physical quantity.

You do not say that body A has Q in quantity heat (usma) Yes, it doesn’t make any sense. On the other hand, to say that A sent Q to body B energy The amount transferred is completely sensible. How and why is this energy transferred? As I mentioned, this transfer of energy is due to the difference in temperature of the two bodies.

Temperature is basically a measure of the average kinetic energy of a system. Molecules of one system of higher average kinetic energy (ie at higher temperature) collide and transfer energy and momentum to molecules of another system with lower average kinetic energy (ie at lower temperature). At the macroscopic level, we refer to this transfer as “Heat,usma) see as.

Why can’t energy be redistributed in such a way that at higher temperatures the body absorbs energy rather than transfers it? This would not satisfy the conservation of momentum in such collisions.

## What is heat? usma what

,heat (usma),is the form of energy that transfers between systems or objects with different temperatures (Flows from high temperature system to low temperature system It happens). This heat (usma) Also called energy or thermal energy, usually the heat btu, calories either joule is measured in

heat (usma) It is one of two forms of transferring energy without transferring mass. The energy that a substance has as it heats or cools. It is called heat (usma). (The other is work, force*displacement). Informally, we oftenHeatMeaning of “(usma)”internal energysay, specifically the part associated with the change of temperature and state, but it is actually heat in the thermodynamic sense (usma) Not there.

Whenever a temperature difference or gradient exists, the heat from the hotter to the colder parts (usma) is transferred. There are essentially two mechanisms: diffusion as a result of molecular motion at each point of a constant amount of matter, and radiation, the emission and absorption of electromagnetic waves, over a distance and without the need for a physical medium.

## Definition of heat? usma ko paribhashit kijiye

Heat (usma) is defined as momentary energy. It should be noted that a body cannot contain heat. heat Heat or heat energy is a form of energy that is caused by heat. A body has energy in various forms (eg, internal energy which is the form of energy present due to internal configuration, molecular vibrations, state of the system, etc.). Now, a certain element of this energy flows from higher to lower temperature. And, the energy, when flowing, heat Known as (usma). Only the heat flows.

## What is the SI unit of heat (usma)? usma ka si matrak

heat of si units is joule.

## What is transfer of heat (usma)? ushma ka sthanantaran

Heat transfer can be referred to the transfer of thermal energy from a region of higher temperature to a region of lower temperature.

### This happens in nature in three ways:

#### Driving :-

In this mode heat (usma) is transferred between two bodies which are in actual contact.
You can understand this with a simple example:-

Suppose you are in your class and the professor in the class has a copy in his hand and he wants to pass that copy to the last student so he decided to give the copy to the person sitting in front and then asked him to pass the copy to the back to pass from and repeat this until the copy reaches the last man. This case is similar to conduction. Here the copy can be considered as heat and is being transferred with real contact as the students are passing their back benches touching each other.

#### Convection :-

In this mode heat is transferred by the actual flow of matter between two bodies or you can say by the motion of hot atoms and molecules. I try to explain it with the example given above

Consider the same case when the professor in front wanted to give a copy to the last student and this time also he made the copy sit on the front bench but now instead of passing the copy to the back side he asked the student in advance by going to his seat Provide the copy to the last student and then provide the copy to him.

In this case the copy is again considered as heat, but the heat is now transferred by the actual motion of the particle instead of being passed through the contact as now the student himself went to the last seat and provided the copy .

In this mode heat is transferred from one body to another in the form of electromagnetic waves and this mode does not require any intermediate medium as it can also pass through vacuum. The simplest example is the sunlight we receive.

Let us again try to imagine this with the same example consider the same case where the professor last wanted to provide the copy to the student but this time he picked up the copy and at last threw the copy directly to him. Here copying can be considered as a form of heat and now we can clearly understand that the medium is unaffected and heat transfers directly in the form of waves.

The picture above will try to give you a more accurate look at all these things.

It is a process through which energy can be transferred. The mechanical equivalent of heat by work is the calorie unit. In other words if you use your hand to stir the cake batter (mechanical work) you will be imparting some heat energy to the mixture. Remember, any type of system cannot hold heat, it can only hold energy. The degree of heat energy in a system is measured by a thermometer, which has different unit bases depending on the particular temperature scale you are referring to. The heat energy absorbed or released by a system affects the molecules/atoms from which it is made. In ordinary/ideal cases, the heat energy affects the faster motion of these particles causing more collisions and thus their activity dictates a particular phase in which the system will occur.

It is a process through which energy can be transferred. The mechanical equivalent of heat by work is the calorie unit. In other words if you use your hand to stir the cake batter (mechanical work) you will be imparting some heat energy to the mixture. Remember, any type of system cannot hold heat, it can only hold energy. The degree of heat energy in a system is measured by a thermometer, which has different unit bases depending on the particular temperature scale you are referring to. The heat energy absorbed or released by a system affects the molecules/atoms from which it is made. In ordinary/ideal cases, the heat energy affects the faster motion of these particles causing more collisions and thus their activity dictates a particular phase in which the system will occur.

Heat is energy that is said to be transferred or manifested during a change in the state of a system. State is the state of a system described by temperature, pressure, density, etc. A system is a part of the universe that can be separated from the surroundings by its boundary. This explanation is good when there is physical interaction between the system and the surroundings. Radiation wave energy is the heat that occurs when there is no contact even when there is no change of state according to Prevost’s theory of heat exchange.

Heat is not a stored form of energy but it is energy in transit. similar to work. Whereas potential energy, kinetic energy, thermal energy, chemical energy are all stored forms of energy.

Heat is the energy that spontaneously passes between a system and its surroundings by some means other than the transfer of work or matter. When a suitable physical pathway is present, heat flows spontaneously from a hotter to a colder body. Transfer can occur by contact between the source and destination entities, as in conduction; or by radiation between distant bodies; or by conduction and radiation through a thick solid wall; or through an intermediate fluid body, as in vascular circulation; or a combination of these.

Since heat refers to the amount of energy transferred between two bodies, it is not a state function of either body, unlike temperature and internal energy. Instead, according to the first law of thermodynamics, the exchange of heat during a process contributes to the change in internal energy, and the amount of heat can be determined by the amount of work that will bring about the same change.

Heat is a form of energy. So what we call heat is actually thermal energy and thermal energy is released in whatever material it is present in. (Don’t think about it too much, just treat it like vibration or something. When a body has thermal energy it has atoms in it. In an excited state)

It should be noted that the term heat was widely spread before people understood it and that many works in thermodynamics and “heat” transfer were done using the term heat. So he left the word unspoken. But whenever someone says heat you must understand that he is talking about thermal energy.

Usually many people get confused between heat and temperature. so what you need to know

• is heat energy (thermal energy).
• It can be moved or transformed but cannot be destroyed.
• When objects store heat or thermal energy, they become hot.
• When they lose heat they become cold.
• We measure this heat and coolness using some scales known as temperature scales.
• It should be clearly noted that the measurement of temperature itself is not the measure of heat.
• Temperature and thermal energy are directly related but temperature is something that we have created for our convenience.
• We can only measure the difference in heat or thermal energy in the form of a unit called joule and it is the same unit that is used to measure work.
• Why only measure the difference in energy because that’s usually what we’re interested in.
• We are usually not concerned about how much energy something has because it is almost impossible to measure and a waste of time.
• The above statement will be confusing if you ever get to read about fuel and that is because there you will measure the energy content of a fuel.
• But what you have to understand is that you only calculate how much energy the fuel can release based on the experimentally measured known values.
• You only calculate the energy released by the breaking of chemical bonds.
• In addition to that energy there are various electrical, magnetic and other energies within the fuel.
• In fact, a fuel that was at room temperature prior to combustion means that it has already received heat energy before combustion.
• So as you can see you are not concerned about the energy that is already there, but only the difference in energy. (before combustion and after combustion).

## What is meant by heat and heat (usma)?

heatIt is a form of energy that is transferred from one object to another through conduction, convection or radiation.

Molecules inside the object move at some speed due to which this heat (usma) energy is generated. If we say “the metal is hot” it means that the molecules are moving very fast, colliding with each other and producing heat. And if we say “the metal is cold” it means that the molecules are moving very slowly, so there are fewer collisions and less heat is produced.

TemperatureWe use various instruments to measure this thermal energy and it gives readings in units. ie temperature.

Just like a thermometer is used to measure body temperature, it actually measures the body heat emitted into the environment.