Condensation And Evaporation Flashcards
What happens when a gas cools
The particles in the gas slow down and loose kinetic energy and pull the particles closer together
If the temperature gets cold enough the gas particles get closer together that..
Condensation can take the place, the gas becomes a liquid
What does water vapour do when it comes into contact with cold surfaces?
The air condenses
What is the steam rising from the boiling kettle?
It is water vapour condensing to form tiny water droplets as it spreads into cooler air
What is evaporation?
It’s when liquid turns to gas
Particles can evaporate from a liquid at temperatures that are..
Much lower than the liquids boiling point
Particles at the surface of a liquid can escape and become gas particles if:
The particles are travelling in the right direction to escape.
The particles are travelling fast enough to overcome the attractive forces of the other particles
What particles are most likely to escape from an evaporating liquid?
The ones with the most kinetic energy so when they do the average speed and Kinetic energy of the remaining particles decreases.
What happens when the average particle energy decreases?
The temperature of the remaining liquid falls
What happens to the rate of evaporation if the temperature is higher? The density is lower? The surface area is larger? The air flow over the liquid is greater?
The particles will escape quicker
What happens to the rate of condensation if the temp of the gas is lower? The temp of the surface is lower? Density is higher? Airflow is less ?
The rate of condensation will happen faster
What is condensation?
It is when a gas turns to a liquid
