Why are there dark clouds before it rains? Why do fish in ponds die in large numbers after it rains?

Many curious kids must be wondering, why are there dark clouds before it rains? It is not true that it will rain when there are dark clouds, but it will rain only when the dark clouds accumulate to a certain thickness and weight. In the early stage of raindrop formation, cloud droplets mainly rely on constantly absorbing water vapor around the cloud body to condense and sublimate themselves, so that the surface of cloud droplets is often in a supersaturated state, causing the cloud droplets to continue to grow and become raindrops. Because cloud droplets need water vapor to help them to rain, today we will turn on the why mode. Should we open or close the windows during the plum rain season? Why do fish ponds die in large numbers after it rains? Let's take a look!

Contents of this article

1. Why are there dark clouds before it rains?

2. Should windows be opened or closed during the rainy season?

3. Why do fish die in large numbers after it rains in fish ponds?

Why are there dark clouds before it rains?

Dark clouds are the source of rain. When dark clouds accumulate to a certain thickness and weight, rain is formed. In the early stage of raindrop formation, cloud droplets mainly rely on constantly absorbing water vapor around the cloud body to condense and sublimate themselves, making the surface of cloud droplets often in a supersaturated state, causing cloud droplets to continue to grow and become raindrops.

It doesn't mean it will rain when there are dark clouds. It will only rain when the dark clouds accumulate to a certain thickness and weight.

When the fog droplets are dense enough, they become white clouds visible to the naked eye. As the fog droplets grow larger, the white clouds turn into dark clouds.

After the rain, the humidity of the air decreases, the water vapor returns to an unsaturated state, and the small water droplets in the dark clouds begin to evaporate and become smaller and smaller, thus turning the dark clouds into white clouds.

Should windows be opened or closed during the rainy season?

It is recommended to close the windows during the rainy season. Generally speaking, the air humidity is relatively high during the rainy season. If the windows are kept open, the humid air will penetrate into every corner of the room, which can easily cause clothes to mold. It is recommended to wait until the weather is clear before opening the windows for ventilation.

Meiyu refers to the weather and climate phenomenon that occurs in a certain area and season. Meiyu is a weather and climate phenomenon unique to East Asia, and in China it is a weather and climate phenomenon unique to the middle and lower reaches of the Yangtze River.

The day when the plum rain starts is called the beginning of the plum rain season, and the day when it ends is called the end of the plum rain season. The time of the beginning and end of the plum rain season varies. In Zhejiang Province, the beginning of the plum rain season is generally the first Bing day after Grain in Ear, and the end of the plum rain season is the first Wei day after Lesser Heat.

When the rainy season comes, you can use a dehumidifier or turn on the air conditioner to extract moisture from the air, or place lime in bedrooms, kitchens and other spaces, which generally can absorb moisture.

Why do fish die in large numbers after it rains in ponds?

The possible reasons are:

1. When it rains, a large amount of water from outside flows into the fish pond. Fish like to face the water, and a large number of fish crowded together can easily cause mechanical damage to the fish bodies.

Second, rain may cause the death of a large number of phytoplankton, and the oxygen in the fish pond will decrease. Third, the environment in the fish pond will change after rain, and it will not be suitable for fish survival.

After rain, the environment of the fish pond may be changed, such as water temperature, pH value, oxygen, salinity, total hardness, etc., which will also affect the survival of fish to a certain extent.

Water quality care should be done before the rainy days come to avoid large-scale fish deaths.

It is recommended to drain the rainwater in the fish pond in time. If draining water during the rain, the upper layer of water should be drained to ensure that it is rainwater that is drained.