🔄 Changes in Materials, 🌍 Many things around us keep changing all the time., 🧊 Some changes are clearly visible, like ice melting., 💧 Some changes are not easily seen, like water moving underground., Types of Changes, ⚙️ Physical changes – e.g. melting of ice, 🧪 Chemical changes – e.g. ripening of fruits, battery getting used up, Changes by Speed, ⚡ Fast changes – e.g. melting, 🐢 Slow changes – e.g. weathering of rocks, Reversible and Irreversible Changes, 🔁 Some changes are reversible – Example: melting ice, ⛔ Some changes are irreversible – Example: cooking food, 🔋 A used battery cannot be restored easily

Changes in Materials

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