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Across 1. Ability to take part in chemical reactions 3. Readily capable of catching fire 6. A state of equilibrium, or a tendency to reach equilibrium 7. The degree to which something is poisonous 8. A measure of the disorder that exists in a system

Down 2. The downward pressure exerted by the weight of the overlying atmosphere 4. Something that prevents or reduces the passage of heat, electricity, or sound, for instance, a special material or a layer of air. 5. Ability to change into a vapor at a relatively low temperature.