Calculating Thermal Speed VTh with R Constant

  • Thread starter Thread starter negation
  • Start date Start date
  • Tags Tags
    Speed Thermal
AI Thread Summary
The discussion centers on calculating thermal speed (VTh) using the formula VTh = sqrt[(3RT)/M], where M represents molar mass. Participants question which R constant to use, highlighting confusion over the existence of multiple constants. Clarification is sought regarding the Boltzmann constant and the ideal gas constant, particularly which one fits the equation's units. The conversation also touches on the contexts in which the Boltzmann constant is utilized. Understanding the appropriate constant is crucial for accurate thermal speed calculations.
negation
Messages
817
Reaction score
0
VTh= sqrt[(3RT)/M] where M is the molar mass

How do we determine which R constant to use?
 
Science news on Phys.org
What do you mean? Do you suppose there is more than one?
 
Last edited:
nasu said:
What do you mean? Do you suppose there more than one?


Isn't the boltzman constant and the ideal gas constant?
 
Which constant has the proper units to fit into the equation?
 
Who uses R for the Boltzmann constant?
 

Thread 'Entropy and configurations of microstates'

I was watching a Khan Academy video on entropy called: Reconciling thermodynamic and state definitions of entropy. So in the video it says: Let's say I have a container. And in that container, I have gas particles and they're bouncing around like gas particles tend to do, creating some pressure on the container of a certain volume. And let's say I have n particles. Now, each of these particles could be in x different states. Now, if each of them can be in x different states, how many total...
View full post »
Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Let's say we have a cylinder of volume V1 with a frictionless movable piston and some gas trapped inside with pressure P1 and temperature T1. On top of the piston lay some small pebbles that add weight and essentially create the pressure P1. Also the system is inside a reservoir of water that keeps its temperature constant at T1. The system is in equilibrium at V1, P1, T1. Now let's say i put another very small pebble on top of the piston (0,00001kg) and after some seconds the system...
View full post »

Thread 'Condensate rate of water for an air conditioning cooling coil'

I need to calculate the amount of water condensed from a DX cooling coil per hour given the size of the expansion coil (the total condensing surface area), the incoming air temperature, the amount of air flow from the fan, the BTU capacity of the compressor and the incoming air humidity. There are lots of condenser calculators around but they all need the air flow and incoming and outgoing humidity and then give a total volume of condensed water but I need more than that. The size of the...
View full post »

Similar threads

B Can we use molecular speed of gas formula also for the air?
Replies
3
Views
1K
I Concept of Thermal Equilibrium in the Context of Canonical Ensemble
Replies
5
Views
3K
I Interseasonal heat storage / sand battery insulation?
Replies
27
Views
4K
I Cannot understand formula for molar heat capacities of an ideal gas
Replies
22
Views
3K
I Estimating a thermal equilibrium on a custom made fridge
Replies
23
Views
2K
Possible error sources in thermal conductivity experiment?
Replies
16
Views
14K
I How Can Internal Energy of the Canonical Ensemble Change (Fluctuate)?
Replies
15
Views
2K
Thermal Imaging of people and background temperature
Replies
1
Views
1K
Thermal velocity of a soccer ball
Replies
16
Views
4K
Thermal conductance of an angular section of a disc
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top