This is why these 9 familiar things must have their own special colors

People are endowed with eyes that can be said to be wonderful. The average person can perceive up to 7 million colors, and thanks to this ability, we can apply colors in a very flexible way, thereby making life a lot easier. .

One of the most striking examples of this is the application of color to everyday objects. Have you ever been curious, when a tire is almost always black, toilet paper is required to be white, or a fire hydrant is not always red? Everything has a reason.

1. Fire hydrant - 4 colors

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The fire hydrant is not always red, but usually has 4 colors: red, orange, green and blue. But the important thing is that each color has its own meaning.

In the United States, the color of a fire hydrant depends on its capacity, meaning the ability to spray gallons of water per minute (GPM). In which, the red color is 500 gallons (1 gallon = 3.79 liters); orange is 500 - 1000 GPM; green is 1000 - 1500 GPM; and lam is over 1500 GPM.

2. Commercial aircraft are always painted white

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Most commercial airplanes today are covered with white paint. It seems that this is a very obvious fact, but this paint also has a meaning.

The purpose of white paint is to improve the ability to reflect the sun. Thanks to this color, the damage caused by the sun will be reduced, helping the fuselage not overheat. In addition, when landing, the white aircraft also takes less time to cool down the engine, before continuing to the next flight.

3. Tires - always black

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No tires are black, right? But one thing you probably don't know is that the rubber used to make tires is actually white.

Black tires come from carbon. People add carbon to the rubber to increase the life of the tire, and thereby turn the tire into black. It is thanks to becoming black that the tires become sturdier and more durable, becoming a good conductor of heat and better protected from the effects of ultraviolet rays.

4. Traffic lights - 3 meaningful colors

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Traffic lights have 3 colors Red - Yellow - Orange. The meaning of these 3 colors is like, maybe everyone can grasp. But why are these 3 colors?

There is also a reason. Red is the color with the longest wavelength in the observable light spectrum of humans, helping drivers can see from a distance. Orange has a shorter wavelength than red, but is still longer than green, so it is the first choice.

Thanks to this arrangement, the change from green to yellow, yellow to red becomes more obvious when viewed from a distance.

5. The crosswalk is plaid

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Pedestrian stripes are designed with alternating black and white stripes, and this contrast helps them become more visible when viewed from afar . Drivers can therefore easily recognize and slow down, yielding to pedestrians crossing.

Black and white stripes also help passers-by to become more prominent.

6. Taxi is yellow

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Taxis are the type of vehicle that needs to stand out to make it easier for customers to recognize. But they can't use red - that's the color of a fire engine. So, yellow was chosen.

7. Typical pattern of the ball in ball

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When the balls in football were converted to plastic, they were painted white rather than the black dots we see in the picture. After that, adidas sportswear brand decided to add black dots to help the ball become more prominent when recording on TV (at this time only black and white TV only).

8. Toilet paper - always white

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Basically, the toilet paper when it was made is not white, but ivory brown. The white color you see is the product of the bleaching process.

And it's not natural for people to bleach toilet paper. Businesses can add color to paper to have a variety of products, but they do not do so because it will cost more.White is chosen simply because it is most effective.

Also, white makes you feel safer for health - isn't it natural for doctors to wear white?

9. Social network icon - blue

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In the world there are many social networking platforms, each with its own logo with different drawings. But it is a strange fact that many platforms choose blue as the main color - Facebook, Twitter, Linkedin . for example.

The reason is because this color represents safety and reliability. Social networking companies want users to feel confident in entrusting personal information to them, so they choose blue.

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