# E versus e when using scientific notation

When I was calculating pressures in different units, I decided to use Google out of laziness. First I tried:

1.013e-10 mbar


and received a result of:

 7.598125e-11 Torr


Then, I tried:

1.013E-10 mbar


and received a result of:

7.598124847e-11 Torr


Clearly they are close, but what is causing one to be more precise than the other? I was under the impression that they were synonomous notations for Exponent, (10E6) = 10^6. Am I wrong in their definitions or is it some kind of coding truncation? In case this is unclear, here is the conversion page I used

• Interesting find. There shouldn't be any difference, but apparently some mechanism in Google's converter discriminates the two. – Arthur Feb 1 '16 at 22:26
• You are using a capital E so it's viewed as more imperative/authoritative and yields more digits... – A.S. Feb 1 '16 at 22:28
• who knows wha t Google is doing under the covers - here's a link the c stanard printf which can format using e or E, but as far as I can see, this is just the lower/case choice, there doesn't seem to be any deeper meaning as far as I can see. I don't think this is a math question. – user247608 Feb 1 '16 at 22:44