KNOW WHY AIRPLANES CAN'T FLY IN SPACE !

Airplanes can easily fly in the sky but one question that might come to your mind is why it can't reach space? In this article, we will discuss the reasons that are stopping airplanes to fly in space.

1.) Earth's gravity: In order to reach space, the airplane needs to escape the earth's gravity. This requires a minimum speed of Mach 33 (25,000 mph). The current world record for the fastest plane is only Mach 6.7 (5,140 mph).

 2.) Less/ No oxygen: As the altitude rises the amount of oxygen reduces. The reduction in oxygen leads to difficulty in combustion. This leads to a reduction in thrust.

3.) No lift: At a higher altitude, the air isn’t dense enough to support a large airplane. It may produce some lift, but it won’t be enough to prevent the airplane from falling down to a lower altitude where the air is denser. In space, of course, there is no air whatsoever. Without the presence of air, neither a large airplane nor a small airplane will produce lift. There’s simply no air to travel over and under an airplane’s wings in space, which is the main reason airplanes can’t fly in space.

On the other hand, rockets do not need outside air to lift them. 

Rockets use some of the basic laws of nature. One of these is called Newton's third law. It says for every action there is an equal and opposite reaction. Most rockets use high-speed gases. These gases come out of the burning rocket fuel. These gases push the rockets up and away from Earth. They push the rocket up into space where there is no air. Remember: rockets do not need air to lift them up as planes do. Thanks for reading the article. 

KNOW WHAT DOES "CE" MARK MEAN ON ELECTRONIC DEVICES !

You might see the various marking on electronic devices. One such marking is "CE" marking. Have you ever thought about what does this marking mean? Let's discuss the meaning of this marking in the following article.

What is CE mark?

CE is an abbreviation of the French phrase ‘Conformité Européene’ which literally translates as ‘European Conformity.’ The term initially used was "EC Mark" and it was officially replaced by "CE Marking" in the Directive 93/68/EEC in 1993.

What does this mean?

The CE Marking serves as a declaration from the manufacturer that their product complies with the essential requirements of the relevant European health, safety, and environmental legislation laid out in the different product directives. Once a product has been awarded the CE Marking, then it is able to move freely within the European Free Trade Association (EFTA) and the European Union (EU). CE Marking on a product permits the withdrawal of the non-conforming products by EEA customs and enforcement/vigilance authorities.

Why CE marking is required?

For a company trying to sell a product, getting a CE marking makes things much easier because it means you can sell the product anywhere in the EU. Also, it takes care of any possible hazards caused due to the use of the product. In short we can call it a symbol of quality. Hope, now you understand the meaning of CE written on the electronic device. Thank you for reading the article.

KNOW WHY GLUE DOES NOT STICK TO ITS TUBE !

Glue is known for its instant sticking properties. They develop a strong bond to the area of application. But have you imagined why it does not stick to the container in which it is kept? Let's explore the reason behind this in the following article.

The regular glue is made up of a variety of chemicals called polymers. These polymers are long strands that are either sticky or stretchy. Glue manufacturers have to find just the right combination of sticky and stretchy polymers to make the best glue. Water is used with most of the glues to keep it in the liquid state.

When you put glue on a piece of paper, water is exposed to air. The water eventually evaporates. As the water evaporates, the glue dries and hardens. All that's left are the sticky polymers that hold things together. This process is called mechanical adhesion.

When white glue is inside a bottle, there's not enough air inside the bottle to cause the water to evaporate to make the glue sticky. Basically, the bottle protects the glue from the air and keeps the glue runny. If you've ever left the top off a glue bottle for a while, you may have noticed that, unfortunately, the glue dried up!

In glues like fevistick, water is not used. Instead of the polymers in fevistick, it contains a chemical called cyanoacrylate. This chemical tightens together when it reacts with water vapor in the air. This process is called chemical adhesion.

So, we saw air plays a major role in the sticking and hardening properties of glue. So now you know why glue does not stick to the container in which it is kept. Thanks for reading the article.

KNOW WHY HOTELS USE WHITE BEDSHEETS !

We generally see white bedsheets in hotels. But have you ever given a thought to why only white colour is used? It gets dirty faster, still, hotel owners prefer to use the white colour, why? Let us answer this question through this article.

The prime reasons for white bedsheets are as follows:

1.) White makes the environment bright: Changing the bedsheets make the entire room bright. Designs and patterns become more visible against white than any other colour.

2.) Standard of cleanliness: White bedsheets are one effective way for hotels to prove their standards of cleanliness. Much like how the wealthy used to wear all white to show that they could afford to keep it clean, hotels use all-white linens to show luxury.

3.) The Colour Psychology: According to colour psychology, white stands for purity and perfection. Imagine a clean room but with red or blue bed linen. Can you be sure of its cleanliness? White gives this assurance.

4.) Maintenance: These bed sheets have to be washed daily. So if it would be any other colour, it would fade out soon. There is no such problem with the white colour. That is the reason why towels are also white in colour.

5.) Easy washing: White colour can be bleached easily. Also, when hotel staff do the washing, they can throw bed linens, towels and any other dirty fabrics into the same washing machine without worrying about any colours running (as they all are white).

Did you enjoy reading this article? Are you curious about any such questions? Leave a comment below and watch this space for more.

KNOW WHY CONSTRUCTION SITES ARE WRAPPED WITH GREEN CLOTHES INSTEAD OF ANY OTHER COLOUR !

You might have seen green-colored clothes wrapped around the building that is under construction. Have you ever imagined why this is done? Why only green coloured cloth is selected? Why not any other colour? In the following article, we will discuss the reason behind this.

The green cloth that is wrapped on buildings is also known as a safety net. Following are the reasons for wrapping it: 

1.) Safety reasons: It is used as a covering to prevent any construction material from falling outside the site and causing any damages.

2.) Reduces dust: They reduce the dust coming out of the construction site. These clothes are sprayed with water when high dust work is ongoing onsite so the dust gets stuck in the wet cloth and a comparatively reduced amount spreads in the air.

3.) Cuts down sunrays: The green color of the cloth cuts down the sunrays to the structure resulting in better absorption of water in the walls during curing of the structure.

4.) Alert the public: People who are passing by become cautious of a construction site around, can take care of safety measures required.

5.) Prevents distraction: Construction team working can be kept away from getting deviated from what's happening around. The cloth allows air to circulate around, remains breathable.

6.) Suspense: Project's architectural look can be hidden till it is fully completed and open for all, a little suspense is always delightful.

You will definitely have the question that why black is not used instead of green. This is because green is easily visible from a distance compared to white or black. Apart from this, it also reflects on a little light.

So, now you know the reason behind the green clothes on construction sites. If you have any other reason, feel free to mention that in the comment box. Thank you for reading the article.

Also read:

IRON CABLES ARE FABRIC INSULATED !! WHY??

WHY IN A THREE PIN PLUG THE EARTH PIN IS THICKER AND LONGER THAN OTHER PINS!!

DIFFERENCE BETWEEN EARTHING AND GROUNDING EXPLAINED !!

KNOW WHY THERE IS A CUT IN PIN OF ELECTRIC PLUG !

Things that we see in our day-to-day life might look quite normal to us but there is some logic behind the way it is. One such thing is the cut that we see on the pin of the electric plug. Let's know the reason behind this cut on the pins of the electric plug.

The cut that you see is only present on the pins manufactured from brass. Pins manufactured from aluminum do not have this cut. Sometimes brass is coated with nickel to prevent it from rusting, as a result, these pins look like steel.

The reason for providing this cut is effective heat dissipation. As brass is a good conductor of heat it gets heated due to continuous current flow. This may result in the expansion of the pin, due to which ejection of the plug may become difficult. The cut provided in the pin increases the surface area and hence results in faster dissipation of heat.

Another reason for this cut is that in case of expansion due to heat, this provides a margin for the expanded part to accommodate. Also, a cut in pin makes pins slightly flexible in thickness and allows it to fit in the socket properly.

Some local manufactures of plugs do not provide this cut, it is suggested not to use them. So, now you know the reason behind the cut in pins of an electric plug. If you have any other reason, feel free to mention that in the comment box. Thank you for reading the article.

Also read:

IRON CABLES ARE FABRIC INSULATED !! WHY??

WHY IN A THREE PIN PLUG THE EARTH PIN IS THICKER AND LONGER THAN OTHER PINS!!

DIFFERENCE BETWEEN EARTHING AND GROUNDING EXPLAINED !!

KNOW WHY DOORS OF PUBLIC TOILET ARE NOT TILL THE FLOOR !

When using a public restroom, you might have noticed that the doors don’t touch the floor. This seems odd, considering that most people want privacy when relieving themselves. Have you ever thought about the reason behind this? Let's explore why these doors do not touch the floor in this article.

1.) Easier to Clean: Public restrooms need frequent cleaning so by having a gap at the bottom, bathroom partitions are much easier to clean.

2.) Emergency Access: In a fully enclosed stall, if a person fainted or had a health problem that left them unconscious, it would take a long time before someone noticed it. This is not the case with restrooms with short doors.

3.) More Affordable: Partitions that don’t extend from the floor to the ceiling don’t have to be custom made to fit a room’s exact measurements and they don’t require as many materials to construct. This makes them considerably more affordable.

4.) Better Ventilation: Floor to ceiling stall door walls would likely require additional ventilation to be added to ease the flow of air through the stalls and throughout the lavatory. Short doors provide proper ventilation.

5.) Check the occupancy: Having a gap at the base of a partition allows people waiting in line to see if a stall is occupied or vacant.

So, now you know the reason behind the short doors of public restrooms. If you have any other reason, feel free to mention that in the comment box. Thank you for reading the article.