Why do traffic lights have 3 colors of red - yellow - blue and toilet paper must be white?
White toilet paper, traffic lights come in three colors (blue, red, yellow), stripes and stripes . The following article will help you understand why these familiar things have special colors. own.
1. Traffic lights
We are all familiar with the 3 colors red - yellow orange - green of the traffic lights and the meaning of these 3 colors. But why these 3 colors and not the other colors?
All have its causes. 3 colors red - yellow orange - green are the colors with the longest wavelength in the visible light spectrum, so people can see clearly from a distance away both day and night.
2. Commercial aircraft are always painted white
Currently, most commercial aircraft are coated with white paint, and this paint also makes sense. Specifically, please see in the article 'Why do people often choose white to paint aircraft rather than other colors?'.
3. Fire hydrant
Many of us often default to a red pillar. However, in fact, the fire hydrant usually has 4 colors: red, orange, green, blue and each color has its own meaning.
In the US, the color of a fire hydrant depends on its ability to spray water, in gallons of water per minute (GPM), 1 gallon = 3.79 liters.
Specifically, blue is above 1500GPM, green is 1000 - 1500GPM, orange is 500 - 1000GPM, and red is 500GPM.
4. The crosswalk is plaid
The pedestrian crossing of the street is marked by stripes and the black of the road surface creating a contrast that makes them more visible from a distance. This helps drivers easily recognize, thereby reducing vehicle speed. In addition, black and white stripes will help pedestrians crossing the road become more prominent.
5. Characteristic pattern of soccer ball
You may not know, the first ball in football when switching to plastic is only white. Then, to make the ball stand out even more when recording on TV, at that time the TV was only black and white, so adidas sportswear company decided to add black dots.
6. Tires are always black
You may not know, the rubber to make tires really is white. So why are tires black, for details see 'Why are car and motorbike tires black, not other colors?' okay.
7. Toilet paper is always white
When first made, toilet paper is ivory brown rather than white. After that, people bleach the toilet paper to make it most effective. Manufacturers can add color to paper to make products more diverse, but so will cost more, so they do not.
In addition, white also gives users a sense of security.
8. Social network icons - blue
Many major social networks in the world choose blue as the main color on their own logos such as Facebook, Twitter, Linkedin . The reason is because blue makes it safe and reliable, which is why Social networking company wants to give users.
- Scientists have successfully created a "reverse solar cell" that generates electricity in the dark
- What bad thing would happen to Earth if the sea was no longer salty?
You should read it
- Should you throw toilet paper into the toilet or trash?
- Incidentally: Used toilet paper can be recycled into electricity
- Printer has white stripes - Causes and solutions to print with white stripes
- Top best black and white wallpaper for phones
- How to convert color photos to black and white Photoshop
- Round eyes with 10+ most hegemonic toilet icons on the planet
- Make artistic black and white photos with PhotoScape
- Smart lights made of paper can change color and brightness
May be interested
- Buy sunscreen gloves go cheap, where to play golf cheap?so where to buy cheap sunscreen gloves? please refer to the suggestions below to find a reliable shopping address!
- Why is water wet, fire hot?what kites make wet and hot fire?
- Cordyceps what cure?not only brings beauty effects, helps the body supple, durable, cordyceps has long been considered by the chinese as a precious medicine. so what cure cordyceps? this article will help you understand correctly and better about the effect of this drug that is considered as a 'panacea'!
- To reduce the risk of myopia, let your children play outside for at least 1 hour a daychildren who are educated early, and who are in a competitive educational environment, are at risk of developing myopia early and progressing as a child.
- Does using induction hob affect health?does induction hob affect health, how to use induction hob for safety and energy saving? find out in the article below!
- What bad thing would happen to Earth if the sea was no longer salty?if you turn all salt water into fresh water, life on earth will be turned upside down.