What is light water? How to use in English

The term "light water" is commonly used in the context of nuclear energy, specifically in reference to a particular type of reactor coolant used in nuclear power plants. The coolant is a substance that helps regulate the temperature of the reactor, preventing it from overheating. The term "light water" refers to ordinary water, also known as H2O, which is found in its liquid state at temperatures below 100°C (212°F) at standard atmospheric pressure. In nuclear power plants, light water is the most commonly used reactor coolant due to its excellent properties that make it an ideal choice for this application. Firstly, light water has a relatively low density, which results in a relatively lower level of neutron absorption compared to other types of coolants, like heavy water or liquid metals. Neutron absorption is a critical factor that can impact the efficiency and safety of the reactor. Secondly, light water is widely available and relatively inexpensive, making it a practical choice for large-scale nuclear power generation. Thirdly, being an excellent moderator, light water can slow down the high-energy neutrons produced in the reactor core, making them more likely to undergo fission reactions, which is essential for the production of usable energy. Overall, the use of light water in nuclear power plants provides a safe, cost-effective, and efficient cooling process, making it the most commonly used reactor coolant globally.