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1. Heat

2. Importance of Water Vital for Life: Water is necessary for all living organisms. It is involved in vital biological processes, such as photosynthesis , nutrient transport, and waste removal. Environmental Significance: Water helps in maintaining healthy ecosystems and plays a key role in energy production, agriculture, and socioeconomic development. Daily Usage: Water is an integral part of daily activities like drinking, cooking, bathing, washing, and watering plants. It is also crucial for industrial processes. Forms of Water A. Solid Form of Water (Ice and Snow) B. Liquid Form of Water (Rivers, Lakes, Oceans) C. Gaseous Form of Water (Water Vapor)

3. Heat: Heat is the total energy of the motion of the molecules of a substance. The heat is dependent on factors like the speed of the particles, the size of the particles and the number of particles, etc. Types : Latent Heat and Sensible Heat Unit- Joules, Calories a) Latent Heat Refers to the heat energy absorbed or released during a phase change (e.g., solid to liquid, liquid to gas) without a change in temperature. Example: Heat absorbed during evaporation or released during condensation.