# 1.95e7 conversion

1. Nov 4, 2004

### Bcisewski

Can someone help? It may seem elementary, but I have an application identifying a radius of 1.95e7m. What does the 1.95e7m convert to?

2. Nov 4, 2004

### Staff: Mentor

exponential notation

1.95e7 means $1.95 \times 10^7$. (And m = meters.)

3. Nov 4, 2004

### Bcisewski

1.95e7 is the same as 1.95x10^7?

4. Nov 4, 2004

### Integral

Staff Emeritus
Yes, they are the same.

5. Nov 4, 2004

### exequor

hey guys but isn't "e" and "E" different. for example e1 = 2.718 and E1 = 10. if you want it to be the same as 1.95x10^7 then i suggest you use a capital E so as not to confuse.

6. Nov 4, 2004

### Staff: Mentor

I've never seen it used that way. I've always seen 1.95e7 = 1.95E7 = $1.95 \times 10^7$. In this context, I believe that e or E just stands for "exponent". (Personally, I always use E. )

7. Nov 5, 2004

### Sirus

Generally something in the form of $A.BCeX$, where X is an integer, is considered to be $A.BC\times{10^{X}}$, although this is not a definite rule. It is better to write it in the latter form to avoid confusion.

8. Nov 6, 2004

### BobG

It's a calculator based tradition. Calculator's, especially your early LED's, weren't very good at displaying scientific notation the way you do on paper. It's displayed 1.95e7 or 1.95E7 on a spread sheet, as well, for the same reason.

9. Nov 6, 2004

### cepheid

Staff Emeritus
As DocAl, Integral, Sirus, and BobG pointed out, whenever $\text{e\ \or\ \E}$ appear in this context (on a calculator or computer) it refers to a power of ten. It should not be confused with $e$, Euler's number, the irrational constant. Just thought I'd clarify that.

10. Nov 6, 2004

### exequor

ok i understand what you guys are saying, i just made the point because on my calculator the two of them are two different e's. the exponent is "E" and the constant is "e".