Page 19 - Finalll Science BB Prep2 t1 2025_Neat

P.O.C

Exp. 4 Air Currents
Exp. 3 Humidity %

1 2 1 2

Controlled Surface area of liquid Temperature

variables Temperature Humidity %
Air currents Surface area
Independent Diff. in humditiy %
Air currents
(water vapor in air)
variable

Dependent Evaporation rate in 2 is Evaporation rate in 1 is

greater than that in 1 greater than that in 2
variable
Conclusion Evaporation rate increases Evaporation rate increases by
by decreasing humidity increasing air current
Explanation Trapping water vapor in air Air currents increase the
in (2) reduces the evaporation of more water

evaporation molecules from the liquid
surface

Increasing ( Temp, Surface area & Air currents)

Decreasing (Humidity)

• Wet clothes dry during the day faster due to:
higher temperature & lower humidity.

• Feeling uncomfortable in hot humid weather as:

Sweat increases but its evaporation decreases in high humidity.

First Term 28