Question 43
Look back at the example of using hydrogen as a fuel at the start of the chapter. Hydrogen fuel cells generate electricity and water as by-products due to a chemical reaction within the fuel cell. Using hydrogen is not a new idea – it was suggested as the future fuel for cars in the 1990s. From 2021 to 2022, the number of hydrogen-fuelled cars rose by 40%. But with only 72 000 hydrogen cars worldwide, they are still rare.
Why do scientists talk about different colours of hydrogen?
Why do scientists talk about different colours of hydrogen?
