What is the difference between weight and mass?

What is the difference between weight and mass?

wer: C. Everything has a mass (measured in kg) that remains constant anywhere in the universe. On the other hand, weight is a force (measured in newtons) that depends on the acceleration of the mass. Since the acceleration due to gravity on Mars is ⅓ of that on earth, a person would weigh ⅓ as less on Mars. BUT their mass would remain the same.