Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I have two very specific questions.

I was trying to read this paper :

http://downloads.bbc.co.uk/looknorthyorkslincs/sun_climate_connection.pdf

and i noticed that equation 3 and equation A6 were different :

Eq3 : L(t)=Q(t)/£(t) (not dimensionally correct)

and

Eq A6 : L(t)=Q(t)/£(t) * delta_t

When you read under equation 3, you understand why this is like that ; they say :

"As seen in Eq.(A6) of Appendix A, lifetime indeed has the dimension of time, being multiplied by the sampling time interval (which is here equal to unity–1 day)."

Questions:

1/ Is it ok to have a dimensionally wrong equation if you say why in the text right next to it (i.e. numbers have a dimension and here because the time interval chosen is unity ) ?

2/ Is it common practice in Physics to do that ?

Thank you !

Note : i do not want a comment on the paper itself, just on this specific point.

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# Dimensional homogeneity

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