Cooling Effect

Transcript

In which Case, water is cooler? Water in Stainless Steel Pot Water in Earthen Pot (Matka) ↓ Water is cooler in this case due to Cooling Effect What caused Cooling Effect in Matka? Matka(Earthen Pot) has tiny pores Water seeps out through them and come out They evaporate due to heat of sun For Evaporation, heat is required So it takes this heat from water inside pot So water inside pot becomes cool (Evaporation causes cooling effect) Why we feel Cooler under a Fan? Our Skin has tiny pores When we feel hot, water comes out through these pores. This is called Sweat. The moving air from the fan helps the sweat to evaporate faster Evaporation needs heat This heat is taken from our body So, our body loses heat and we feel cooler under a fan (Evaporation causes cooling effect) Take two earthen pots of different sizes. 3 Place the smaller pot into the centre of the larger one Fill the bottom of the larger pot with a layer of sand. 4 with more sand. with more sand. 5 6 How to make Pot in Pot Cooler ? (Electricity Free Cooler) How to make Pot in Pot Cooler? (Electricity Free Cooler) You can also make a drawing of the pot-in-pot cooler once it is ready. Allow 4-5 hours for the mini pot-in-pot cooler to cool down. The time range can be influenced by many conditions. Observe and discuss how it creates a cooling effect inside the pots. Keep some vegetables and fruits in it and observe for a week on a daily basis to check for the freshness of the vegetables and fruits kept inside the cooler. You will have to add water regularly to keep the sand moist How to make Pot in Pot Cooler? (Electricity Free Cooler) Question. For how many days can the vegetables and fruits be kept fresh in it? Vegetables and fruits can be kept fresh for about to days, depending on the surrounding conditions and type of vegetables or fruits. How to make Pot in Pot Cooler? (Electricity Free Cooler) Question. What are the conditions which can affect the number of these days? The freshness period depends on : Temperature of the surroundings Humidity of air Air movement (wind) Regular supply of water to keep the sand moist Type of vegetables and fruits stored teachoo How to make Pot in Pot Cooler? (Electricity Free Cooler) Question. What else can be used in place of sand for better cooling? Materials like fine clay, sawdust, ash, or soil can be used in place of sand, as they can hold water and allow evaporation.