How does a blimp stay in the air?

A blimp is an airtight bag that is able to rise in the air because it is filled with light gases.  A blimp is a small, balloon-like airship.  Unlike the heavier-than-air airplane, the blimp remains aloft because it is lighter than air.  

It needs only small motors to push it forward.  Blimps are descendants of the simple balloon. The blimp's lift comes from a lighter-than air gas that raises the blimp in the same way a balloon is lifted.

A balloon rises because the gas inside the balloon is much lighter than the air round it, and so it floats in the atmosphere, in much the same way a ship floats on water.  The gas inside the blimp expands and fills out the blimp.  Its gasbag has no framework inside, and collapses when the gas is taken out.

Some airships, such as the dirigible, have an inside framework that supports the sides, and do not depend on the pressure of the lifting gas to maintain their shape.  During World War II, blimps protected ships by spotting enemy submarines.  

They were also used for observation, photographing enemy positions and for rescues at sea and on land.  Today, blimps with signs painted on their sides are used mostly for advertising and sightseeing. – Dick Rogers

What is a heat lightning?

Heat lighting is the flashes of light produced by distant electrical storms.  The flashes of lightning occur too far away for thunder to be heard.

Sometimes, on warm summer evenings, we see so-called “heat lightning”—silent flashes of light in the distant sky.  Heat lightning is really light from a flash of chain lightning that takes place beyond the horizon.  Chain, or forked, lightning is the lightning you see zig-zagging across the sky in any thunderstorm.

We just don’t hear heat lightning’s thunder because we are too far away.  We don’t see the lightning either.  We see its light reflected from high clouds.  Lightning is a big electric spark that spears its way across the sky.  During a thunderstorm, electrical charges are built up in the clouds.  If the charges become great enough, a flash of lightning occurs.

As the lightning flashes across the sky, it quickly heats the air in its path.  The heated air expands (spreads out) rapidly and sets a great sound wave in motion which we hear a few moments later as thunder.

Where Does Dust Come From?

Dust

Housekeepers spend a good deal of time dusting.  Dust settles from the air and makes a gray coating over everything around us.  

Dust is more that just specks of dirt.  In the ordinary dust you could collect from a windowsill, you would find tiny chips of rock, bits of dead wood and dried leaves.  

Dust may also have in it spores from plants, pollen from the powder in flowers, spot from smoke, cinders left from meteors burning up on their way to earth, and other bits of matter that float in the air.  Dust may drift hundreds of miles before finally setting because of gravity.-Dick Rogers

How is nylon made?

Nylon

Nylon is a product of a chemical process in which carbon, nitrogen, oxygen and hydrogen are united to form a strong, tough material.

Nylon is a strong, long-lasting synthetic material.  Its uses range from such things as shear hosiery and fishing lines to toothbrush bristles and molded parts for machinery.

Nylon is made from common elements obtained from coal (carbon) and air (oxygen and nitrogen) and water (hydrogen).  These elements are heated, mixed and treated to such a way that they are changed into a substance called “nylon salt.”  

The nylon salt becomes a thick, gooey liquid when it is heated.  The melted nylon is spread out into a thin sheet to cool.  When hard, the sheet is cut into chips.  The chips are then melted and manufactured into final products.

To make yarn for weaving stockings and fabrics for clothes, the melted nylon is pushed through time notes in a metal plate.  Several threads of nylon are then twisted together into a single yarn and then stretched to make the nylon strong.–Dick Rogers

What makes the wind blow?

Wind Blow

Wind is caused chiefly by the uneven heating of the earth by the sun.  All winds, from gentle breezes that rustle leaves to raging hurricanes, are caused chiefly by the uneven heating of the earth by the sun.

When the air near the ground gets hot, it expands or swells.  This makes it lighter, and light air rises.

As it rises, cooler, heavier air flows in to take its place.  This movement of air makes a wind.

When the air moves slowly, we call it a breeze.  When it moves fast and strong, we may call it a gale or a hurricane.

If you live by the seashore, for instance, you may feel a cool sea breeze on a warm day.

During the day, the land becomes warmer than the sea and so does the air above it.  As the warmer, lighter land air rises, cool winds blow in from the sea to take its place.

All night the land cools more rapidly than the sea, and the breeze is reversed.  It blows out to sea.

What is true in your area is true on a larger scale of the big winds that blow over the earth.

A wind gets its name from the direction it comes from.  A north wind, for example, is one coming from the North blowing toward the South. – Dick Rogers