Float Data Value and Scientific Notation

Hello All,
SQL Server converts some of the float value into scientific notation for example 0.00001 will be stored as
1E-05.
Is there any simple method\formula\threshold to precisely tell when some particular value will be converted to scientific notation?
Also I think oracle store same value above i.e. 0.00001 as it is with float data type but not the case with SQL Server. Any reason for the same?
Thanks in Advance.
-Malkesh

Thanks Erland.
I got your point that internal storage as you mentioned will be 53 bit and 11 bit exponent of 2. However my question remains the same that is there any method\threshold from which we can say that after this numeric value stored data will be represented in
scientific notation or any rule of thumb? For example
drop
table #t
CREATE
TABLE #T (T1
FLOAT)
INSERT
INTO #T (T1)
SELECT 0.000001
INSERT
INTO #T (T1)
SELECT 0.00001
INSERT
INTO #T (T1)
SELECT 0.0001
INSERT
INTO #T (T1)
SELECT 0.001
INSERT
INTO #T (T1)
SELECT 0.01
INSERT
INTO #T (T1)
SELECT 0.1
INSERT
INTO #T (T1)
SELECT 1.
INSERT
INTO #T (T1)
SELECT 1.0
INSERT
INTO #T (T1)
SELECT 1.01
INSERT
INTO #T (T1)
SELECT 1.001
INSERT
INTO #T (T1)
SELECT 1.0001
INSERT
INTO #T (T1)
SELECT 1.00001
INSERT
INTO #T (T1)
SELECT 1.000001
INSERT
INTO #T (T1)
SELECT 1.0000001
INSERT
INTO #T (T1)
SELECT 1.00000001
INSERT
INTO #T (T1)
SELECT 1.000000001
INSERT
INTO #T (T1)
SELECT 1.0000000001
INSERT
INTO #T (T1)
SELECT 1.00000000001
INSERT
INTO #T (T1)
SELECT 1.000000000001
INSERT
INTO #T (T1)
SELECT 1.1
INSERT
INTO #T (T1)
SELECT 10.1
INSERT
INTO #T (T1)
SELECT 100.1
INSERT
INTO #T (T1)
SELECT 1000.1
INSERT
INTO #T (T1)
SELECT 10000.1
INSERT
INTO #T (T1)
SELECT 100000.1
INSERT
INTO #T (T1)
SELECT 1000000.1
INSERT
INTO #T (T1)
SELECT 10000000.1
INSERT
INTO #T (T1)
SELECT 100000000.1
INSERT
INTO #T (T1)
SELECT 1000000000.1
INSERT
INTO #T (T1)
SELECT 10000000000.1
INSERT
INTO #T (T1)
SELECT 100000000000.1
INSERT
INTO #T (T1)
SELECT 1000000000000.1
SELECT T1
FROM #T
Here you can see value < 0.0001 i.e. 0.00001 and 0.000001 both are in scientific notation. So which rule or formula drives this behavior that is what my question is. Sorry I am somewhat poor in mathematics fundamentals So if you can make it simple.
Thanks Again.

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TABLE2,ABCD,EEEE
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TABLE2,EEEF,GGGG
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