Drinking coffee can predict the weather?! It's true!
At the end of March, Ching Ming Festival was also at hand. It is not just that the saying "caught in the drizzle during the Qingming Festival" is not just said. It is believed that many people in Guangdong Province have also experienced a few days of shit. Turn on the weather forecast, it has been raining for a whole week, it makes you upset.
But the weather forecast is always so subtle, when everyone goes out, the sun is shining. So the lucky mentality will always hover in your ear: don't take an umbrella. I'll be back in a minute. It won't rain. However, not long after the goose went out, Uncle Heaven was against you, and suddenly it began to rain heavily.
When the weather forecast says rain but are not sure if it will rain when we go out, we can make a cup of coffee! As long as a cup of coffee and a sugar cube, you can know the weather in a short time!
The life knowledge of guessing the weather with a cup of coffee comes from the book "knowing the Weather with a Cup of Coffee" by the British writer Matthew Cole. It is mentioned in the related content: order a cup of coffee, throw a cube of sugar into the coffee, and observe the bubbles released by the cube sugar without stirring. If the bubbles gather in the center, the air pressure is very high, the weather will clear up soon; and if the bubbles gather around the cup indicates that the air pressure is very low, the weather is either heavy rain or heavy snow.
Some friends may think that this phenomenon is like Turkish coffee divination. In fact, this magical phenomenon has a scientific basis. Because coffee beans contain oil, and the oil floats on the surface of coffee to form surface tension. When the cube sugar is placed in the hot coffee, it releases bubbles as it dissolves, and the bubbles are suspended on the surface of the coffee liquid to act as a barometer.
In the same horizontal plane, if the air pressure distribution is uneven, the air flows from the high pressure area to the low pressure area. The air in the higher pressure area will flow horizontally to the surrounding area, and the air above the high pressure area will decrease, as the atmospheric pressure increases with the decrease of height. When the high air drops, the pressure on it increases, the volume decreases, and the temperature rises (that is, the PV/T=C learned in high school physics). The central area of high pressure is not conducive to the formation of clouds and rain, and it is often a cloudless sunny day. Vice versa.
Do you suddenly feel that drinking a cup of coffee can also contain so much scientific knowledge, even a little itchy, want to try it at home? It should be noted that bubbles can float on the surface of the coffee liquid to act as a barometer because of the proper coffee oil. Instant coffee and hand-brewed coffee are not the best choices, while freshly ground hot American coffee is the best choice.
In addition, in the choice of sugar, the content of the book also mentions square sugar, not ordinary granulated sugar. That is because there are breathable pores between the grains of the cube sugar used in coffee, which is more conducive to the formation of bubbles when dissolved.
Speaking of which, the coffee shop took the friends to review the influence of atmospheric pressure on the weather in high school geography. How do you feel?
"at this moment, I just want to turn on my phone and watch the weather forecast! If it says it's raining, I'll take an umbrella. I won't get away with it! "
Photo Source: Internet
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