Corrected entry: Hand grenades do not create a massive fireball - even in a lab full of combustible chemicals, the heat from a grenade wouldn't be high enough to ignite them.
Noman
11th Mar 2013
I Am Legend (2007)
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Correction: The flash point of acetone is -4 F and the flash point of diethyl ether is -42 F. Both of these could definitely be present. Either of these chemicals could generate a "fireball" above these temperatures. Ether is particularly nasty in this regard. I have personally seen an ether flame appear to "jump" twelve feet. Any flame or spark is all that is necessary.
Noman ★