Need some help with a science project!!!

Aaaaahhh, there ya go, jumpin' to confusions, Mart the Fart did not specify that they would displace the same volume of water, simply that it would displace the same volume. It will, indeed displace the same volume of air.

BUT, back to the original post; I think she oughtta just pile up a bunch of all four kinds they got, set 'em on fire, and cook up a mess of hot dogs, burgers, and marshmallows

1.) Take a big pine split , burn it, and then record the max temp and how long it burns.
2.) Take a big oak split, burn it, record mas temp, and how long it burns.