Water boils when its vapor pressure equals the atmospheric pressure. This typically happens at 100°C (212°F) at sea level. However, boiling points vary with altitude and atmospheric pressure. “Static vapor pressure of water is equal to atmospheric pressure.”
Tiwari Academy Discussion Latest Questions
The process of a substance changing into vapor before its boiling point is called evaporation. Evaporation occurs at the surface of a liquid at temperatures below the boiling point, driven by the escape of high-energy molecules into the air.
Man feels discomfort due to humidity because sweat does not evaporate efficiently in high humidity. Evaporation of sweat cools the body, and when humidity is high, this process is hindered, leading to overheating and discomfort.
Rice cooks quickly in a pressure cooker because high pressure increases the boiling point of water. This elevated boiling point allows the water to reach higher temperatures, cooking the rice more rapidly. Therefore, the correct answer is [B] High pressure ...
When a piece of ice floating in a glass of water completely melts, the level of water in the glass remains unchanged. This is because the volume of water displaced by the ice is equal to the volume of water ...
Skating on ice shows that on increasing the pressure, the melting point of ice decreases. The pressure exerted by the skater lowers the melting point of the ice underneath the skate blades, causing a thin layer of ice to melt, ...
When two pieces of ice are pressed together, they stick together because the increased pressure lowers the melting point of ice at the point of contact. This allows a thin layer of ice to melt, creating a temporary liquid bridge ...
During summer days, water kept in an earthen vessel stays cool due to evaporation. The porous nature of the earthen material allows water to seep through and evaporate from its surface, drawing heat energy from the surrounding water and keeping ...
The process of making camphor vapor from solid camphor is called sublimation. Sublimation is the direct transition of a substance from its solid phase to its gas phase without passing through the liquid phase. When solid camphor is heated, it ...
Dew is not formed on a strong windy night because the rate of evaporation is fast. The movement of air removes the thin layer of moisture near the ground, preventing dew formation.