2 reasons why water in outdoor swimmng pool is heated faster & remain warmer if covered by transparent plastic

Answer 1

Clear plastic (transparent) allows the photons of sunlight through to heat the water. Although the plastic is a thin insulator saving a little heat, it mainly prevents evaporation and the loss of heat of vaporization which is a huge savings. Wet one wrist and blow on both. Notice how much cooler (from loss of heat!) that the wet wrist feels.

Answer 2

Insulation is a factor, but not the major one.

The major factor is green house effect. The plastic sheet allows higher frequency IR rays(heat rays) from the sun to enter, but traps the lower frequency-higherwavelength-lower energy light inside, by totalk internal reflection. Hence heat remains trapped inside, and water gets warm and stays warm.

It is similar to the inside of a car getting heated up, when placed in sunlight with windows drawn up.

Answer 3

1) the air between the plastic sheeting and the surfacew of the water forms an isulating blanket, preventing heat loss

2) The plastic sheet restricts heat loss through air movement over the water surface.

Answer 4

heat transfers to cold. without the ability to rise from the water it stays in the water longer with insulating factors from the plastic.

Answer 5

Sunlight adds heat to the water, and plastic holds it in more efficiently.