Which of the following is NOT a main factor affecting the rate of evaporation?
Buoyancy
Evaporation is the process by which a liquid changes into vapour at its surface.
The main factors that affect its rate are surface area, temperature, wind speed and the humidity of the surrounding air.
A larger surface area, higher wind speed and lower humidity all speed up evaporation.
Buoyancy is the upward force on an object in a fluid and has no direct role in controlling the rate of evaporation.
Therefore, the factor that is NOT involved is Buoyancy.
A liquid is heated up to a certain temperature. Which one of the following situation would correspond to the boiling of the liquid?
Which one among the following oxides has the highest melting point?
Equal volume of all gases, when measured at the same temperature and pressure, contain an equal number of particles. Who proposed the above law?
Match List I with List II and select the correct answer using the code given below the Lists:
List I (Noble gas) | List II (Use) |
A. Argon | 1. In lights for advertising display |
B. Neon | 2. Airport landing lights and in light houses |
C. Krypton | 3. Light in photographer’s flash gun |
D. Xenon | 4. In tungsten filament to last |
Match List-I with List-II and select the correct answer using the code given below the Lists:
List I (Process) | List II (Type of change) |
A. Heating of camphor | 1. Chemical |
B. Cooling of water vapor up to room temperature | 2. Evaporation |
C. Cooking an egg | 3. Condensation |
D. Formation of water vapor at room temperature. | 4. Sublimation |