Water evaporates faster at higher temperatures, when its surface area increases and when exposed to moving air. The concentration of water and other substances in the surrounding air and air pressure also affect evaporation rate.
Raising the temperature of water increases the kinetic energy of surface molecules, hastening the rate of evaporation. A larger surface area boosts the number of surface molecules present, allowing more to escape as water vapor. When humidity is at 100 percent, the air is saturated and cannot accept more water vapor. Moving air channels saturated air away from the liquid, effectively lowering concentrations of water and other substances in the local air. In addition, high surface pressure impedes vapor escaping into the air.Learn More
Wind increases the rate of evaporation by removing air already laden with water vapor from above the water. The rate of evaporation depends, in part, on the existing level of water vapor in the surrounding air, since water vapor condenses at the same time as water evaporates in normal circumstances. Strong winds also move the water, expanding the amount of surface area available for evaporation.Full Answer >
The brand of kettle is needed to determine the exact amount of electricity used, but most kettles have an average wattage of 2 or 3 kilowatts or kW. If a 2 kW kettle is used for 2 hours then it has used 4 kWh.Full Answer >
Water is a liquid at room temperature because the hydrogen bonds within its construction are weak. These weak bonds hold water molecules together for mere milliseconds, which keeps water in a constantly liquid state at room temperature.Full Answer >
Any abstract concept, such as love or happiness, or type of energy, such as sound, light or heat, is not considered matter. Ideas, thoughts, time, speech and music are further examples of non-matter.Full Answer >