Question

two students carried out an investigation in which they measured the evaporation rate of water under different conditions. the following table summarizes their findings.
evaporation rate of water

beaker number	1	2	3	4	5
starting volume (ml)	45	50	50	55	45
final volume (ml)	30	30	20	15	10
water lost (ml)	15	20	30	40	35
elapsed time (hours)	24	24	24	24	24

the students concluded that water evaporates most quickly at 85°f.
why would a scientist question the validity of this conclusion?

Explanation:

The starting volumes of water in the beakers are not consistent. Also, the elapsed time is the same for all, but other factors like surface - area to volume ratio might not be controlled. These uncontrolled variables can affect the evaporation rate and thus question the conclusion.

Answer:

The starting volumes of water are different and other variables may not be controlled.