[Rhodes22-list] Difference Between #1, #2, #3, ... ,#6 Fuel Oil?

[Kroposki]

Roger,
	1.  Thank you for the reply, but hopefully it did not interfere
with your school work.  You are supposed to be doing research on
creating a organically based (corn by product) fuel to send NASA to
mars....
	2.  You said "kerosene or #1 fuel oil, #2 fuel oil, #4 fuel oil,
#5 light, #5 ....."  Is kerosene #1 fuel oil or more refined?
                  Ed K