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The Science of a Campfire

Across
material such as coal, gas, or oil that is burned to produce heat or power.
a hot glowing body of ignited gas that is generated by something on fire.
a small fiery particle thrown off from a fire, alight in ashes, or produced by striking together two hard surfaces such as stone or metal.
a substance that flows freely but is of constant volume, having a consistency like that of water or oil.
a process that involves rearrangement of the molecular or ionic structure of a substance.
easily set on fire.
the action of setting something on fire or starting to burn.
heat seen as a form of energy arising from the random motion of the molecules of bodies, which may be transferred by conduction, convection, or radiation.
a part of the trunk or a large branch of a tree that has fallen or been cut off.
Down
the condition of being protected from or unlikely to cause danger, risk, or injury.
an open-air fire in a camp, used for cooking and as a focal point for social activity.
a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid).
firm and stable in shape; not liquid or fluid.
combustion or burning, in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke.
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
a visible suspension of carbon or other particles in air, typically one emitted from a burning substance.
the process of burning something.
dry, flammable material, such as wood or paper, used for lighting a fire.
easily combustible small sticks or twigs used for starting a fire.
a black powdery or flaky substance consisting largely of amorphous carbon, produced by the incomplete burning of organic matter.