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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: jadelamlam on August 22, 2012, 07:06:00 AM

Title: n-butane and isobutane
Post by: jadelamlam on August 22, 2012, 07:06:00 AM

The autoignition temp of n-butane(straight chain) is 288 degree Celcius while that of
isobutane(branched chain) is 460 degree Celcius.
The flash point of n-butane is -60 degree Celsius while that of isobutane is -83 degree Celcius.

I was confused by these..Why does n-butane have a higher flash point but a lower autoignition temperature?
(same case in n-octane and isooctane)

Title: Re: n-butane and isobutane
Post by: Hunter2 on August 22, 2012, 07:32:08 AM

Check definition of autoignition temperature and flash point.