Which common household item works based on the principle of Pascal's law?

Which scientific law explains that every object attracts every other object with a force proportional to their masses?

What is the approximate speed of light in a vacuum?

Which everyday process explains why water boils at a lower temperature at high altitudes such as on mountains?

Which scientific instrument is used to measure very small distances such as the diameter of a wire or thickness of a sheet?

Which vitamin is essential for proper blood clotting and is often associated with green leafy vegetables?