Science · ENGLISH
A puddle can disappear without ever boiling.
Separate evaporation from boiling, then design a small observation of your own.
Start with something ordinary
After a shower, a wet patch on the floor can gradually shrink. A tempting rule is that water becomes gas only when a kettle boils. The shrinking patch gives you a reason to question that rule. Ask what changed, rather than assuming the water must have reached the temperature used for cooking.
The change happens at the surface
Evaporation turns liquid water into water vapour. It can occur below the boiling point at the liquid surface. The US Geological Survey describes evaporation as an important route by which water moves into the atmosphere; water does not need to be boiling to take that route.
Try a comparison you can interpret
Put equal small amounts of water in two similar shallow dishes. Keep one covered and leave the other uncovered in the same safe place. Mark the starting levels and inspect them later. Keep the container size, starting amount and observation time the same. You are trying to change one condition so the comparison is easier to interpret. No heating is necessary.
An observation is not a complete explanation
If the levels change differently, record what happened before deciding why. A spill, a leaky container or different starting amounts would weaken the comparison. “I saw less water” is an observation; “this particular process explains all of the loss” is a claim that needs the setup checked. That distinction is useful far beyond this experiment.
Read the process, not the setting
In a question, follow the starting and ending states. Liquid water becoming vapour points to evaporation. A photograph of a kettle may distract you into thinking only about boiling. A fair question describes the process directly instead of relying on the mood of an illustration. In practice mode, explain the state change aloud before revealing the answer.
Where does rainwater go next?
Water that enters soil is infiltrating. Water that flows across the surface toward a stream is runoff. The two processes can happen during the same rainstorm, and the balance depends on conditions such as soil, slope, vegetation and impervious cover.
Groundwater in many aquifers fills pores between particles and fractures in rock. It is not generally a giant empty underground lake. Connected spaces allow water to move; the presence of water alone does not tell you how quickly it can flow or replenish a well.
Plants are part of the route back to the air
Plants take up water and release water vapour through transpiration, including through their leaves. Evapotranspiration combines transpiration with evaporation from surfaces. Those terms distinguish routes, rather than different kinds of water.
For a puddle that shrinks, evaporation is one possible route, but infiltration or drainage may also matter. A disappearing puddle alone does not measure how much went by each route. The example establishes that boiling is unnecessary for evaporation, not that evaporation explains every loss of surface water.
Sources & further reading
Sources support the factual background. The worked examples and game connections are written for 3 SECONDS.