And finally everything must be covered with mulch, to prevent evaporation.

The column is sealed tightly to prevent evaporation of water and incubated for several months in strong natural light.

The upper ends were closed to prevent evaporation.

"The presence of moisture in the air helps prevent too-rapid evaporation from living bodies," his father said.

A lid is placed on the tub to maintain the water temperature when not in use, and to prevent evaporation.

For example, irrigation can be done at night, preventing evaporation of water.

The expansion of the liquid CO will take up all the space in the bottle, preventing evaporation.

Hence these narrow leaves, which seek to defend themselves against the light, and prevent too great evaporation.

The oil floats on the surface of the water and creates a liquid seal preventing further evaporation.

"Wax" that has washed off the leaves also coats the ground around the base of the plant, further preventing evaporation.