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What are the rare earth elements? Rare earth elements (REEs) are a group of 17 chemical elements found in the Earth’s crust. Despite their name, they are relatively abundant in the Earth’s crust compared to some other elements, but they are called “rare” because they are not often found in concentrated and economically exploitable deposits. … Read more

Ultrasonic waves, also known as ultrasound, are a type of sound wave with frequencies higher than the upper limit of human hearing. The human hearing range typically extends up to around 20,000 hertz (Hz), while ultrasonic waves have frequencies greater than this threshold. Ultrasound is commonly used in various fields due to its unique properties … Read more

How invented the lithium battery? The invention of the lithium-ion battery is credited to Dr. John B. Goodenough, a physicist and solid-state chemist, along with his colleagues. In the 1970s, Goodenough was working at the University of Oxford in the United Kingdom when he made significant contributions to the development of lithium-ion battery technology. The … Read more