KNOW WHY WHITE PACKETS ARE USED IN NEW PRODUCTS !

We’ve all seen those little white packets that come in the box when we buy a new pair of shoes, a bottle of vitamins, a bag or a new purse. You might be wondering what this white packet is and what is it used for? Let us discuss all these questions in this article.

These little white packets are called silica gel bags. The technical name for it is silica xerogel, but most people just call it silica gel.These bags are filled with a substance called silicon dioxide, a non-toxic inert desiccant that has the power to dry out moisture.Silica, or silicon dioxide (SiO2), is the same material found in quartz. The gel form contains millions of tiny pores that can adsorb and hold moisture. Silica gel is essentially porous sand. Silica gel can adsorb about 40 percent of its weight in moisture and can take the relative humidity in a closed container down to about 40 percent. Once saturated, you can drive the moisture off and reuse silica gel by heating it above 300 degrees F (150 C).

Silica gel packets are used to absorb moisture and keep things dry.

Many manufacturers add these desiccant packs to their new products to keep them fresh and moisture-free for the consumer.In leather products and foods like pepperoni, the lack of moisture can limit the growth of mold and reduce spoilage. In electronics it prevents condensation, which might damage the electronics. If a bottle of vitamins contained any moisture vapor and were cooled rapidly, the condensing moisture would ruin the pills. You will find little silica gel packets in anything that would be affected by excess moisture or condensation.

So, now you know why these packets are used in new products. You also knew how these bags work. Thank you for reading the article.

KNOW WHY BOWLERS RUB BALL IN CRICKET MATCH !!

While watching cricket match you might have seen bowlers rub the ball often against their trousers. Have you even wondered why bowlers do so? We will discuss the reason behind the rubbing of ball in this article.

Actually, whenever you rub the ball, no umpire or match referee tells you anything. At the same time, if you violate the ICC rules while rubbing it, then you also have to pay its loss. Let us first tell you why the bowler does this. Whenever the ball is new, it falls straight, very little swing (out swing, in swing or reverse swing) is found. In such a situation, only the batsman gets the benefit which no bowler wants.

Bowlers try to make the ball shine and smooth mainly for making it to slip on the bat and make it possible to render the batsman out by catches at slips and by the wicket keeper. The smooth ball is also likely to misbehave while it is hit for a bigger shot and are caught anywhere in the field an on boundaries.

Now,let us understand the science behind this.

When bowler is rubbing one side of ball he is actually polishing or smoothening the surface of the ball. Other half of the ball remains as it is or more rough. When bowler throws the ball at high velocity, low pressure is created near smooth surface and high pressure area is created on rougher side. This pressure differential SWINGS ball in air.

To look at this aerodynamically, one must understand the concept of boundary layer formation and separation. Boundary Layer is a layer of fluid (in this case, Air) which tends to stick to the surface of the object (The ball) when the object tries to move through the fluid. The boundary layer does not cause any effect on the object’s flow through the fluid (except for resistance) until it separates. Boundary layer separation occurs when the flow velocity increases to such an extent that the pressure difference increases drastically in the flow direction. Boundary Layer separation causes formation of eddies which then resist the movement of the flowing object. The Boundary Layer formed on any surface can be either Laminar or Turbulent. 

In Laminar Flow, the flow of the fluid is in organised parallel lines. Whereas, the Turbulent Boundary Layer the fluid particles move in disorganized and intersecting paths.Therefore, ball is made rough so that turbulent boundary layer is formed which results in disorganized movement of ball.

In conclusion, we have seen that science behind rubbing the ball.Thank you reading the article.

KNOW WHY VENTILATIONS ARE PLACED AT TOP OF THE ROOF !

We see doors and windows in our room in daily life. They are placed in such a way that we can pass through them easily. But, when we see ventilation, they are always placed at the top of the room. Have you ever imagined why are they placed on the top, why not near the window? We will discuss why ventilations are placed on top of the roof in this article.

Ventilations are basically window like structure that is used to pull out hot air in a room. Ventilation moves outdoor air into a building or a room and distributes the air within the building or room. The general purpose of ventilation in buildings is to provide healthy air for breathing by both diluting the pollutants originating in the building and removing the pollutants from it.

Ventilators are kept at the top of the roof to pass the hot air inside a room to pass outwards. As hot air is lighter than cold air relatively, it goes up near the ceiling & passes through ventilators as a result cold air finds its way to come in to fill the room. Hence, this ensures a circulation of air inside a room. Also, ventilation at the top ensures an ample amount of sunlight to enter into the room.

During night time, ventilators allow the cold air to flow inside the room. It also secures the oxygen level in a crowded room by circulating air. 

Home ventilation is important to keep the house and its occupants healthy and comfortable. Ventilation is a key component to maintaining proper indoor air quality. Ventilation keeps air flowing through the home, eliminating contaminants, moisture buildup, and odors.

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