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.