The temperature difference between two adjacent isotherms is the same. How to explain this sentence?

That is to say, when the temperature differences between two adjacent isotherms are equal, the temperature difference will be larger if the isotherms are dense and the temperature difference will be smaller if the isotherms are sparse. For example, on an isotherm map with a scale equal to 50 kilometers from the field.

If there are two isotherms and the temperature difference between adjacent isotherms is 2°C, then the temperature difference within a range of 50 kilometers is 2°C - 6°C, that is, the isotherms are sparse and the temperature difference is small.

But if there are 4 isotherms and the temperature difference between adjacent isotherms is 2°C, then the temperature difference within a range of 50 kilometers is 6°C - 10°C, that is, the temperature difference is large when the isotherms are densely packed .

The role of isotherms

Isotherms use curved lines to represent areas with the same temperature, visually displaying the temperature difference changes and climate indicators in a certain area. They can be used for both air temperature and water temperature. Its changing trends are usually related to water sources, mountains, vegetation and special weather systems, and are widely used in geography, meteorology and other disciplines.

For the above content, please refer to Baidu Encyclopedia - Isotherm Map