1. Mass stays the same in space

Your mass remains the same whether you are on Earth, the Moon, or Mars. However, your weight changes because each place has a different gravitational pull.

2. You would weight about one-sixth as much on the Moon

The Moon's gravity is approximately one-sixth of Earth's gravity. A person who weighs 60 kg on a typical bathroom scale on Earth would have a scale reading equivalent to about 10 kg on the Moon, although their mass would still be 60 kg.

3. You would weight more on Jupiter

Jupiter's gravity near its cloud tops is about 2.5 times Earth's gravity. A 60 kg person would experience a gravitational force equivalent to roughly 150 kg of weight on Earth. Jupiter has no solid surface like Earth's to stand on.

4. Mass and weight use different units

Mass is measured in kilograms (kg), grams (g), and tonnes (t). Weight is a force measured in newtons (N). In everyday conversation, people often use kilograms when talking about body weight, but scientifically, kilograms measure mass.

5. Astronauts are not actually without gravity

Astronauts aboard the International Space Station experience microgravity because they and the station are continuously falling around Earth together. Their mass remains unchanged even while they float.

6. A bathroom scale does not directly measure mass

A typical digital bathroom scale measures the force exerted on it and converts that force into a mass reading using an assumed gravitational acceleration. That is why the reading can differ in a place with different gravity.

7. Everything with mass has inertia

Inertia is an object's resistance to changes in its motion. Generally, the greater an object's mass, the harder it is to accelerate or slow down by the same amount.

8. Your weight can vary slightly on Earth

Earth's rotation, its shape, altitude, and local variations in gravity affect measured weight. You weigh slightly less at the equator than at the poles, all else being equal.

9. A kilogram of gold and a kilogram of feathers have the same mass

Both have a mass of exactly one kilogram. However, feathers occupy much more space because gold is far denser than feathers.

10. Gravity depends on more than an object's size

An object's gravitational pull depends on its mass and the distance from its center. A massive planet can exert a much stronger gravitational pull than a smaller body, but distance matters too.

11. Scientists can measure incredibly tiny masses

Sensitive scientific balances can detect extremely small changes in mass. Specialized instruments can measure samples in the microgram range and, under suitable conditions, even smaller amounts.

12. Black holes have enormous gravitational effects

Black holes can have immense mass concentrated within a very small region. Their gravity becomes so strong near the event horizon that even light cannot escape from inside it.

13. Mass is conserved in ordinary physical changes

If you cut an apple into pieces, the total mass remains the same, assuming nothing is lost. Chemical reactions also conserve total mass in ordinary chemical processes when all reactants and products are accounted for.

14. More mass usually means more force is needed to accelerate an object

A truck is generally much harder to accelerate than a bicycle because it has much more mass. This is an example of Newton's second law of motion.

15. Mass and energy are related

According to Einstein's famous equation, mass and energy are related. A small amount of mass corresponds to a very large amount of energy, which is important in nuclear reactions.