What does the unit "Js" of the Planck constant mean?

  • #1
Summary:
what means unit j.s in plank constant As Planck's constant is the smallest unit of energy so what this unit j.s
what means unit j.s in plank constant As Planck's constant is the smallest unit of energy so what this unit j.s
 

Answers and Replies

  • #2
220
101
Have you tried to google what “Js” stands for? What did you find?

Also Plancks constant is not an energy (as you would discover by finding out what the ”J” in Js means).
 
  • Love
Likes Fouzan Alaa Almassry
  • #5
vanhees71
Science Advisor
Insights Author
Gold Member
19,073
9,882
Well, first of all the unit Js (Joule times second) tells you that ##\hbar## cannot indicate an energy to begin with, because the unit of energy within the SI is J and not Js.

As I've said very many times in the last few days, the unit Js also gives a hint, what ##\hbar## might indicate. It's a fundamental constant of nature and thus provides a natural measure for some quantity with the unit Js, and that's the same as the unit length times momentum. In turn this indicates that it's the natural measure for phase space volumes, and this turns indeed out to be correct when you consider statistical physics of a many-body system.
 
  • #6
Have you tried to google what “Js” stands for? What did you find?

Also Plancks constant is not an energy (as you would discover by finding out what the ”J” in Js means).
He searched on Google, but did not give an adequate answer and did not give the meaning of this unit
 
  • #7
Planck's constant is important in QM but it is not the smallest unit of energy. It's not even a measure of energy. As you note, its units are ##Js##.

There was a thread about this recently:

https://www.physicsforums.com/threads/does-the-energy-6-626x10-34j-have-any-special-meaning.993063/
Have you tried to google what “Js” stands for? What did you find?

Also Plancks constant is not an energy (as you would discover by finding out what the ”J” in Js means).
The Planck constant, or Planck's constant, is the quantum of electromagnetic action that relates a photon's energy to its frequency. The Planck constant multiplied by a photon's frequency is equal to a photon's energy. The Planck constant is a fundamental physical constant denoted as {\displaystyle h}
h
, and of fundamental importance in quantum mechanics. In metrology it is used to define the kilogram in SI units.[2]
 
  • #8
PeterDonis
Mentor
Insights Author
2020 Award
35,929
13,995
He searched on Google, but did not give an adequate answer and did not give the meaning of this unit

Who is "he"? If you mean you searched, the word "he" doesn't make sense. If you mean you think @Dr.AbeNikIanEdL was supposed to search Google and come up with the answer for you, no, that's not what he was saying. He was saying you should do the searching, and then post again here if you have questions about what you find.
 
  • #9
PeterDonis
Mentor
Insights Author
2020 Award
35,929
13,995
The Planck constant, or Planck's constant, is the quantum of electromagnetic action that relates a photon's energy to its frequency.

That's the physical problem that originally motivated Planck to come up with his constant, but its physical applications are not limited to that.

The Planck constant multiplied by a photon's frequency is equal to a photon's energy. The Planck constant is a fundamental physical constant denoted as {\displaystyle h}, and of fundamental importance in quantum mechanics. In metrology it is used to define the kilogram in SI units.[2]

Do you have a question about any of these things?
 
  • #10
atyy
Science Advisor
14,695
3,174
J = Joule
s = second
J . s = Joule . second
 
  • Like
  • Love
Likes Fouzan Alaa Almassry and vanhees71

Related Threads on What does the unit "Js" of the Planck constant mean?

  • Last Post
Replies
5
Views
7K
Replies
3
Views
2K
Replies
4
Views
2K
Replies
2
Views
963
  • Last Post
3
Replies
50
Views
4K
  • Last Post
Replies
9
Views
3K
Replies
7
Views
789
Replies
8
Views
3K
Replies
1
Views
989
Top