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Topic: Difference between unit symbols?  (Read 1609 times)

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Offline stopkillingme21

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Difference between unit symbols?
« on: February 20, 2017, 12:49:42 PM »
For example:

Planck's constant is 6.63 x 10-34 J·S
The speed of light is 3.00 x 108 m/s

Why does one use a division sign and the other a multiplication sign? Are they interchangeable?
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Offline Hunter2

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Re: Difference between unit symbols?
« Reply #1 on: February 20, 2017, 02:32:41 PM »
No, Speed is everytime the division of length by time like m/s, miles/h ,km/h,etc.

The other one is an  value of action.

https://en.wikipedia.org/wiki/Joule-second
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Offline Enthalpy

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Re: Difference between unit symbols?
« Reply #2 on: February 21, 2017, 12:04:23 PM »
And in electrical engineering, the big S is a siemens (an Ω-1, that is, an amp per volt), so it's important to write the second with a small s.
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