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| THE HOLY QURAN ON FORMATION OF DAY AND NIGHT |
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Meteorologists have only recently come to know these details of cloud formation, structure, and function by using advanced equipment like planes, satellites, computers, balloons, and other equipment, to study wind and its direction, to measure humidity and its variations, and to determine the levels and variations of atmospheric pressure.
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The preceding verse, after mentioning clouds and rain, speaks about hail and lightning:
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This verse may raise a question. Why does the verse say "its lightning" in a reference to the hail? Does this mean that hail is the major factor in producing lightning? Let us see what the book entitled "Meteorology Today" says about this. It says that a cloud becomes electrified as hail falls through a region in the cloud of super cooled droplets and ice crystals. As liquid droplets collide with a hailstone, they freeze on contact and release latent heat. This keeps the surface of the hailstone warmer than that of the surrounding ice crystals. When the hailstone comes in contact with an ice crystal, an important phenomenon occurs: electrons flow from the colder object toward the warmer object. Hence, the hailstone becomes negatively charged. The same effect occurs when super cooled droplets come in contact with a hailstone and tiny splinters of positively charged ice break off.
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Meteorologists have found that these cumulonimbus clouds, that shower hail, reach a height of 25,000 to 30,000 ft (4.7 to 5.7 miles), like mountains. |
These lighter positively charged particles are then carried to the upper part of the cloud by updrafts. The hail, left with a negative charge, falls towards the bottom of the cloud, thus the lower part of the cloud becomes negatively charged. These negative charges are then discharged as lightning. We conclude from this that hail is the major factor in producing lightning.
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