So if you set up a trap, or say, throw alchemist fire at Kerosine Oil, would it explode? What about lamp oil?
I am an alchemist trying to set up a impromptu trap with pints of oil and some Kerosine oil I have on me.
Since you can get 10 uses of 1d3 fire damage, I would assume there would be multiple dice of explosion damage, if it even exploded, Maybe 5d3?
Also, what would be the rule if someone was holding something flammable or explosive and you throw an alchemist bomb or alchemist fire at it?
Oil does not explode, it burns.
Also, what would be the rule if someone was holding something flammable or explosive and you throw an alchemist bomb or alchemist fire at it?
According to the rules on catching on fire:
"Characters exposed to burning oil, bonfires, and non-instantaneous magic fires might find their clothes, hair, or equipment on fire. Spells with an instantaneous duration don't normally set a character on fire, since the heat and flame from these come and go in a flash.Characters at risk of catching fire are allowed a DC 15 Reflex save to avoid this fate. If a character's clothes or hair catch fire, he takes 1d6 points of damage immediately. In each subsequent round, the burning character must make another Reflex saving throw. Failure means he takes another 1d6 points of damage that round. Success means that the fire has gone out—that is, once he succeeds on his saving throw, he's no longer on fire.
A character on fire may automatically extinguish the flames by jumping into enough water to douse himself. If no body of water is at hand, rolling on the ground or smothering the fire with cloaks or the like permits the character another save with a +4 bonus.
Those whose clothes or equipment catch fire must make DC 15 Reflex saves for each item. Flammable items that fail take the same amount of damage as the character."