Why Does Dew Form?

Aristotle, the Greek philosopher who had an explanation for most of the common place events that puzzled his fellows, was wise about dew. It is produced, he said, in serene weather and in calm place. Even thought it may seem that the early morning grass is always covered with shoe soaking dew, that isn’t so. Dew is fussy stuff. It comes only in certain conditions, and these usually promise fine weather.

For dew form, the day must be fine and warm, and followed by a still, cooler evening and night, in which the sky must be clear or almost cloudless. If u were to walk on a lawn or into a grassy meadow at twilight, and hold something cold – a hand mirror or tumbler of ice – just above the surface, you would coon find it coated with water droplets: condense vapour.

On a clear night, the ground radiates the day’s warmth into the skies. The ground becomes much cooler, causing vapour to condense. On an overcast night, clouds send that heat back to the ground, co that is never gets cold enough to form dew.

You may wonder why dew form on a lawn and not, say, on the soil of flower beds. It is not grass attracts dew, but that the plants in flower beds keep the ground warmer. You can check this for yourself by shielding a patch of grass from the night sky. You will need a piece of cotton cloth (a tablecloth will do) and some stick or canes. On an evening when conditions seem right, stretch the cloth over the canes about 30 cm (1 ft) above the lawn. Next morning, before the sun has dried things out, you will find that every ware, except beneath the cloth, the shown is covered with dew.

Why, sometimes, is the ground covered with frost? During the night, the air has got progressively colder. Cold air, heavier than warm air, has performed a layer at ground level, turning the water vapour that should otherwise be dew into frost.

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Why does Moon on the horizon look bigger than when it is high in the sky?

To stand on the seashore or an open plain and watch the huge globe of the moon appear majestically over over the horizon is a commonplace but wonderful experience. Strangely, the moon's orb looks enormous, and it appears to rise quite fast, like a huge gas balloon ascending into the heavens. A short time later, when the moon is higher in the sky, it seems to be much smaller, and it may be difficult to detect that it is still rising.

The moon's size and speed are constant. It moves, in relation to us, at 97 200 km/h and it an orbit that keeps it about 384 400 km from the Earth. Any perceived change in it size or speed in a stick of the eye, an optical illusion. It is not caused, as some people believe, by a form of atmospheric distortion that magnifies the Moon or speeds it up. In fact, atmospheric effects cause the Moon's measured diameter at the horizon to be slightly smaller than when it measured higher in the sky.

The illusion is caused by the way our brain interprets information. A rising Moon is placed on the horizon, and perceived as being more distant than one immediately overhead. Nearly two centuries ago, English mathematician and astronomer Robert Smith concluded that at the horizon the sky appear to be three times as far away as it does at its zenith overhead. This is because land-based object, such as tree and buildings, lead us into a wrongful comparison.

The same trick makes the Moon look bigger. When it is high in the sky, we have nothing to compare it with. Similarly, we think that it is rising faster, because we can see the gap between it and the horizon constantly widening. Later, the gap is too vast for us to detect any movement of the Moon at all.

Another curious example of our brain leading us into mistake conclusion may come when viewing the moon through binocular. Many people claim that the naked eye, the reverse of what is seen when looking at other objects through binoculars. The explanation for this is probably that when we use binoculars other object are excluded, thus removing any basis for comparison.

If u want to see the Moon shrink suddenly in size, try this: hold up a peat arm’s length, and compare it with the Moon. You may be surprised to find that the Moon looks about half the size of an everage pea.