Why 1 liter * atm = 101.33 joules ?

  • Thread starter Tahira Firdous
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In summary, the conversation is discussing the relationship between pressure, volume, and energy in the context of the ideal gas law. The equation 1 L atm = 101.33 Joules is derived from multiplying the gas constant and dividing by the gas constant, and can also be explained using the formula for work. The conversation also mentions the option of converting to SI units to get the answer directly.
  • #1
Tahira Firdous
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Hi ! I have been searching but i am not able to find out that is there any reason behind , why 1 liter * atm = 101.33 joules ?
 
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  • #2
Are you asking why it comes out equal to 101.33 Joules, or why a pressure (atm) time a volume (liter) gives an energy (joules)?
 
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  • #3
Nugatory said:
Are you asking why it comes out equal to 101.33 Joules, or why a pressure (atm) time a volume (liter) gives an energy (joules)?
I am asking that why it is equal to 101.33 joules any logical reason or just a constant ?
 
  • #6
Daniel Hendriks said:
https://lavelle.chem.ucla.edu/forum/viewtopic.php?t=729

multiply the gas constant 8.31447 J/mol K and then divide by the gas constant 0.08206 L atm/mol K.
1 L atm = 101.33 Joules
Even though this is not wrong, is just shifting the question to why 8.31 J equals 0.082 L*atm.
You could just go directly to change the units for pressure and volume to SI units and get the answer.
## 1 atm =1.01 \times 10^5 N/m^2 ##
## 1L =10^{-3} m^3 ##
So
## 1 atm \times 1L = 101 N \cdot m ## or 101 J
 
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  • #7
+1

Consider a piston of area A moving in a cylinder with constant pressure...

Work = Force * displacement ... (1)

Pressure = Force/Area
so
Force = Pressure * Area ......(2)

sub for force in (1) gives...
Work = Pressure * Area * displacement .....(3)

then recognise that
ΔVolume = Area * displacement

so
Work = Pressure * ΔVolume
 

What is the significance of 1 liter * atm in the calculation of joules?

In scientific calculations, 1 liter * atm is a unit used to measure pressure. It stands for one liter of gas at one atmosphere of pressure. This unit is often used in the calculation of energy, specifically in the conversion of liters-atmospheres to joules.

How is 1 liter * atm related to the ideal gas law?

The ideal gas law, PV = nRT, relates the pressure (P) and volume (V) of a gas to its temperature (T) and the number of moles (n) of gas present. In this equation, 1 liter * atm represents the unit of pressure (P) and is used to convert the volume (V) of the gas into a standard unit (liters). This allows for the calculation of the number of moles (n) of gas present, which is then used to calculate the energy (joules) of the system.

Why is 1 liter * atm equal to 101.33 joules?

The conversion factor from 1 liter * atm to joules is based on the definition of the atmosphere as a unit of pressure. One atmosphere is defined as the amount of pressure exerted by a column of mercury that is 760 millimeters high at 0 degrees Celsius. This pressure is equivalent to 101.33 joules of energy per liter.

What is the relationship between pressure and energy in the context of the gas laws?

In the context of the gas laws, pressure and energy are directly related. As the pressure of a gas increases, its energy also increases. This can be seen in the ideal gas law, where pressure and volume have an inverse relationship. When pressure increases, volume decreases, and this results in an increase in energy (joules) within the system.

How is 1 liter * atm used in real-world applications?

1 liter * atm is commonly used in real-world applications in the field of chemistry and physics, specifically in the measurement of gases and their properties. It is often used to calculate the energy of a gas in a closed system or to determine the number of moles present in a given volume of gas. This unit is also used in industries such as pharmaceuticals and oil and gas, where precise measurements of gases are crucial for production processes.

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