Christoph Hormann wrote:

> Dan P wrote:
> 
>> [...]
>>
>> Try substituting the word "brighter" with "more bright" and it may 
>> sound more clear.
> 
> Earth is neither 21% brighter nor 21% more bright than moon assuming the 
> given albedo values.  If you want to give percentual values you have to 
> do it correctly, otherwise simply say the albedo of earth is 0.21 higher 
> than that of earth (which of course isn't a very useful information).

The values are between 0 and 1. If they were between 0 and two, the 
percentage would be half of what I said and so forth.

> The whole thing is probably a bit confusing because the unit of albedo 
> is 1 (it is a ratio between two values of the same unit.  If you have 
> two people, one 1,60m tall and one 1,90m you also would not say one is 
> 30% taller/more tall than the other...

True; but that is a different set that does not map to a range between 
zero and one because it constantly changes. If you took a snapshot in 
time, say the shortest person is A and the tallest person is B, then you 
could normalize the number and, indeed, use percentages.

> Christoph
-- 
Respectfully,
Dan P
http://<broken link>

Post a reply to this message