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General Discussion & Feedback => Just Chat! => Topic started by: syhprum on 30/11/2020 14:01:43

Title: Have astronomers stopped using Ergs per second
Post by: syhprum on 30/11/2020 14:01:43

I have just been reading an article on CNO energy in the Sun , I was pleasently surprised to see the Suns output quoted in Watts instead of the more usual Ergs per second .

Title: Re: Have astronomers stopped using Ergs per second
Post by: alancalverd on 30/11/2020 14:44:14

Quote

The erg has not been a valid unit since 1 January 1978

which suggests that most of the astronomers who published in erg/sec have indeed been prevented from doing so by death. In fact the SI unit was preferred way back in 1970, but it took the EU a while to wake up.

Title: Re: Have astronomers stopped using Ergs per second
Post by: syhprum on 01/12/2020 05:47:57

Will we ever se the back of Angstroms ?

Title: Re: Have astronomers stopped using Ergs per second
Post by: Bored chemist on 01/12/2020 09:03:04

Quote from: syhprum on 01/12/2020 05:47:57

Will we ever se the back of Angstroms ?

We are inching away from them.

Title: Re: Have astronomers stopped using Ergs per second
Post by: evan_au on 01/12/2020 09:10:21

"Barns" have a rustic ring to them...

Quote from: Wikipedia

"couldn't hit the broad side of a barn"

https://en.wikipedia.org/wiki/Barn_(unit) (https://en.wikipedia.org/wiki/Barn_(unit))

Title: Re: Have astronomers stopped using Ergs per second
Post by: Colin2B on 01/12/2020 13:08:19

Quote from: evan_au on 01/12/2020 09:10:21

"Barns" have a rustic ring to them...

Quote from: Wikipedia

"couldn't hit the broad side of a barn"

https://en.wikipedia.org/wiki/Barn_(unit) (https://en.wikipedia.org/wiki/Barn_(unit))

Who said scientists have no sense of humour?
Check out shake (unit) as in "2 shakes of a lamb's tail" and atom bomb

Title: Re: Have astronomers stopped using Ergs per second
Post by: Bored chemist on 01/12/2020 13:22:51

Quote from: evan_au on 01/12/2020 09:10:21

"Barns" have a rustic ring to them...

Quote from: Wikipedia

"couldn't hit the broad side of a barn"

https://en.wikipedia.org/wiki/Barn_(unit) (https://en.wikipedia.org/wiki/Barn_(unit))

Part of a composite unit of energy
The barn. yard. atmosphere is a small amount of energy (About 9.3 X 10^24 Joules).
The yard is a unit of distance and the barn is an area so a barn . yard is a volume and since pressure can be measured in atmospheres a barn . yard . atmosphere is a pressure times a volume and that has units of energy.