Question

Почему дождевая вода мягкая, а речная - жесткая?

Answer 1

Жесткость воды зависит от количества растворенных в ней солей. В дождевой воде нет солей, так как она образуется от испаренной воды.

Answer 2

Why is rainwater soft and river water hard?

Rainwater is generally considered soft, while river water is often classified as hard. This difference in hardness is primarily due to the varying mineral content present in the two types of water sources.

Rainwater is formed through the process of evaporation, condensation, and precipitation. As water evaporates from the Earth's surface, it rises into the atmosphere and condenses into clouds. When the conditions are right, the condensed water droplets combine and fall back to the ground as rain. Since rainwater is formed through this natural process, it is relatively pure and does not contain high levels of minerals or other impurities. As a result, rainwater is considered soft.

River water, on the other hand, is constantly flowing and interacts with the surrounding environment. As rivers flow through the land, they pick up minerals and other substances from the rocks, soil, and vegetation. These minerals, such as calcium, magnesium, and bicarbonates, dissolve in the water and contribute to its hardness. The longer the river flows and the more it interacts with its surroundings, the higher the mineral content and hardness of the water.

It's important to note that the hardness of river water can vary depending on the specific location and geological characteristics of the area. Some rivers may have higher mineral content and therefore be harder than others.

In summary, rainwater is soft because it is formed through the natural process of evaporation and condensation, while river water is hard due to the minerals it picks up as it flows through the land