ELLIE: Hello and welcome to the BBC Bitesize Physics ... its mass in kilograms by the strength of the gravitational field in Newtons per kilogram. JAMES: Right, let's try out some examples then.

Despite ample experimental hints to the contrary, the Standard Model predicts that neutrinos shouldn't have any mass at all.

But gravity only becomes noticeable when you have at least one very big mass (a planet for example). No, the distance is squared in the equation so it would have nine times the force (a third of ...

Now head of Cambridge University's nuclear physics lab ... was less than the atomic mass (average mass of the atom). For example, a helium atom has an atomic mass of 4, but an atomic number ...