IYPT 2019 Elements 031: Gallium: Reading discs and powering the Mars Rover

Element 31 in our International Year of the Periodic Table series is gallium. Gallium is a low melting point metal; combined with arsenic it is used in some types of solar cells, and it’s also a key component of the lasers that read from Blu-ray discs. Though it’s solid at room temperature, gallium’s melting point […]