Dew&dew vitamin c review vn

Air contains water in the form of a gas called water vapor. In the evenings, when warm, moist air passes over cool surfaces, the air cools down. The water vapor in the air begins to condense, or form into small drops. The drops cling to cool surfaces such as leaves, flower petals, and grass. The temperature at which this condensation begins to happen is known as the dew point.

Dew usually forms on clear nights when the air is calm. Dew can form on any surface that is cool and exposed to the sky. It often forms on the ground and on plants because these things usually cool faster than the air. For the same reason, dew often collects on the tops of cars. The time of night when dew begins to form is called dewfall.

Dew can help plants if they are dry. But damaging fungi may form on plants if dew makes them too wet. Dew that contains pollution is another danger. Pollution can get into dew when the water vapor in polluted air condenses. Like acid rain, this polluted dew, called acid dew, can harm living things.

Tree don't care what the little bird sings / We go down with the dew in the morning light / The tree don't know what the little bird brings / We go down with the dew in the morning

• (, but see usage notes) An instance of such moisture settling on plants, etc.

  There was a heavy dew this morning. 1834, L[etitia] E[lizabeth] L[andon], chapter X, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), →OCLC, page 72: On their entrance, Aylmer was greeted by a new surprise—his daughter Lucy, whom he very naturally supposed was quietly in her bed, lay on the window-seat, the casement open, and herself asleep; but the traces of tears were upon her cheek, and her long fair hair loose, and yet saturated with the dews of the night. The formation of dew is sustained by the diffusion of water vapour. Regarding the vertical diffusion of water vapour over soils carrying vegetation, there are two possible situations. First, there is the downward movement of water vapour from the atmosphere, which occurs when the water vapour content of the air increases with height. Second, there is the upward movement of water vapour, which occurs when the soil surface temperature is higher than that of the leaves. Accordingly, dew may be classified (1) as formed when water vapour diffuses downward in the air and (2) as formed from water vapour diffusing from the underlying soil surface. The name dewfall is proper to (1), and dew arising from (2) may be called distillation.

  Britannica Quiz Weather Words Vocabulary Quiz There have been various attempts to measure dew. Among the various instruments are R. Leick’s porous gypsum plates and S. Duvdevani’s dew gauge, consisting of a wooden slab treated with paint. To determine the amount of dew, Leick’s plates are weighed, whereas Duvdevani’s gauge involves the use of an optical dew scale. Other investigators developed recording dew balances whose surface and exposure conform with the surrounding surface as far as possible. It is by means of such dew balances that one can best observe the phenomenon of distillation: on some occasions no gain in weight or even some loss in weight may be recorded despite the fact that dew had formed on the leaves. Clearly, this dew must be attributed to the diffusion of water vapour from one part of the weighed system to another; i.e., from soil to leaves. The amount of dew formed on plants is not well known. It would appear that during dew nights the amounts vary from very small quantities to about 0.02 inch (0.51 millimetre). G. Hofmann (Die Thermodynamik der Taubildung, 1955) estimated that the maximum possible amount is about 0.03 in. for a 10-hour night, but such amounts would occur only under exceptional circumstances. Total annual dew precipitation may lie between about 0.5 in. in cold climates and in nearly arid warm climates, to about 3 in. in semihumid warm climates. Because dew produced by distillation from the soil cannot be regarded as a gain of moisture, not all of the annual dew may be significant from a hydrological point of view. In some desert areas and semiarid regions the net gain may be a substantial fraction of the rainfall, however, and dew may be the principal moisture source for plants and animals. Under such conditions, it also may assume an important role in some aspects of rock weathering. From the biological viewpoint, the usefulness of dew is doubtful, as dew may stimulate the growth of fungi harmful to plants.

  What dew means?

  1. meteorology : moisture condensed upon the surfaces of cool bodies especially at night. wet with morning dew. 2. : something resembling dew in purity, freshness, or power to refresh.

  What is morning dew?

  Dew is the water droplets that we find in the morning on leaves and other things outside, and usually in spring or winter when the air is cold. It is similar to rain because it forms from condensing water vapour.

  What are the two types of dew?

  Accordingly, dew may be classified (1) as formed when water vapour diffuses downward in the air and (2) as formed from water vapour diffusing from the underlying soil surface. The name dewfall is proper to (1), and dew arising from (2) may be called distillation.

  What is the biblical meaning of dew?

  Associated with God's favor and love. Dew is a symbol of resurrection (Isaiah 26:19). Just as the earth brings forth it's dew, so also it shall bring forth the dead to new life. Dew is a symbol of the redeemed and resurrected people of God. Dew is associated with manna and thus food (Exodus 16:13-21).