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Traditional clay pots keep water cool through the scientific principle of evaporative cooling.
Their porous structure allows water to slowly seep to the outer surface of the pot.
As this surface water evaporates, it absorbs latent heat from the water remaining inside, leading to a cooling effect.
Clay pots are typically made from natural earthen clay, rich in fine mineral particles like silica and alumina.
Evaporative cooling is a physical process where the evaporation of a liquid, typically water, into surrounding air cools an object or a liquid. When water changes its state from liquid to gas (vapor), it requires a significant amount of energy, known as the latent heat of vaporization. This energy is absorbed from the remaining liquid water and its immediate surroundings, resulting in a decrease in temperature. The rate of evaporation, and thus cooling, is influenced by factors like temperature, humidity, and surface area.
Simple Analogy: Just as sweating helps cool the human body by drawing heat away as sweat evaporates from the skin, water evaporating from the surface of a clay pot cools the water inside.
Modern desert coolers operate on the identical principle of evaporative cooling, using water evaporation to cool air, demonstrating a technological application of this natural phenomenon.
The use of clay pots represents ancient wisdom and sustainable practices for water storage and cooling, particularly relevant in hot climates, highlighting the efficacy of low-tech, eco-friendly solutions.
General Science; Science & Technology developments and their applications and effects in everyday life.
General Science (Physics); Everyday Science.
General Science; Physics principles.
Consider the following statements: 1. Other than those made by humans, nanoparticles do not exist in nature. 2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics. 3. Nanoparticles of some commercial products which enter the environment are unsafe for humans. Which of the statements given above is/are correct?
Answer: 2 and 3
Consider the following statements: Statement-I: According to the United Nations' 'World Water Development Report, 2022', India extracts more than a quarter of the world's groundwater withdrawal each year. Statement-II: India needs to extract more than a quarter of the world's groundwater each year to satisfy the drinking water and sanitation needs of almost 18% of world's population living in its territory. Which one of the following is correct in respect of the above statements?
Answer: Statement-I is correct but Statement-II is incorrect
Which one of the following is used in preparing a natural mosquito repellent?
Answer: Lemongrass
Medium (General Science principles are consistently tested across various exams).
The process by which a substance in a liquid state changes to a gaseous state, typically occurring at the surface of a liquid.
The amount of heat energy absorbed by a substance when it changes from a liquid to a gas at a constant temperature and pressure.
The property of a material, such as clay, containing pores or voids, allowing liquids or gases to pass through.