This will not harm your engine and there is no need to do anything.
nissan sunny 2010
Either one is fine. 95 is the higher octane petrol, which has a lower ignition point and will burn cleaner, but 91 is pretty high grade as far as commercial petrols go, as well, and would probably be the safer choice of the two, as higher octane fuels are typically intended more for high performance cars.
The factors of 91 are 1, 7, 13, 91 The factors of 95 are 1, 5, 19, 95.
(79, 81, 82, 91, 93, 95, 95) The mean is 88 The mode is 95 The median is 91
The greatest common factor of 91 and 95 is 1
1, 7, 13, 91 1, 5, 19, 95
91 octane petrol will ignite at a lower temperature and burn faster, which can cause knocking in an auto engine. Lead compounds were added at one time to raise the octane rating, but recently engines have been redesigned to work on low (<98) octane petrol (or gas in the US colonies)
91% to 95% water
I would use the lower octane unless the vehicle "pings" excessively and if so use the higher octane
Petrol changes color when mixed with iodine solution due to covalent bonding.
yes.
Petrol is a volatile liquid. The vapours mixed with oxygen are highly combustible.