Heat Released (EXOTHERMIC), Charcoal burning in a grill, Burning LPG gas stove flame, Lighting a wooden matchstick or candle, Decomposing organic waste in a compost heap, Rusting of an old iron roof or gate, Heat Absorbed (ENDOTHERMIC), Making an instant cold compress / ice pack, Plant photosynthesis absorbing sunlight, Mixing baking soda with vinegar or calamansi juice, Baking bread or a cake in an oven, Dissolving chemical plant fertilizer in water

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