Evaporation – Investigating Water’s Disappearing Act

Transcript

Example 1We see Puddles after Rain What happens to them after Sun comes out ? During Rain Rain water collects to form Puddle After Sun Comes Out Rain water Reduces and puddles become dry Where did Rainwater go? Some seep into Soil and Some gets converted into Water Vapour due to heat of sunExample 2 When we Wash Utensils, they are wet How do they automatically get dry? Utensils when they are wet Water droplets seen at the surface of the utensils Utensils when they get Dry Water droplets Reduces and utensils get dry Where did Water go? Some slides from the surface and Some gets converted into Water VapourExample 3 When We Mop the floor, it is Wet How does it automatically get dry? Floor when it gets Dry Water Reduces and Floor gets dry Where did Water go? The water gets converted into Water vapour due to windExample 4 When our body sweat, our body feels wet How does sweat automatically get dry? Body when it sweats Body when it gets Dry Where did Sweat go? The water gets converted into Water vapour due to heatWhat is Evaporation ?Conversion of liquid state (Water) into gaseous state (Water vapour) is called Evaporation Examples Wet clothes become dry due to evaporation If we heat Water, its quantity reduces due to evaporation While making Dosa, We sprinkle water into Hot pan?Where does this water go? The water which is sprinkled on the hot pan gets converted into water vapour and some part of which converts into water droplets. Can we see Water Vapour ? Why ?Water vapour is actually invisible but the presence of tiny droplets of water in the steam makes it visible Where does Hand Sanitizer go when we rub it ? When we rub hand sanitizer, it spreads on our hands and the alcohol in it quickly evaporates into the air. That is why it looks like it disappears. Only a tiny invisible layer stays on our skin to kill germs.