Detailed Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Problem:A substance that regulates and ensures the temperature of a device does not exceed safe values is generally called?, Context: Hydrogen is commonly used in power stations as a coolant in generators due to a number of favorable properties that are a direct result of its light diatomic molecules. These include low density, low viscosity, and the highest specific heat and thermal conductivity of all gases.
Solution:
coolant