Mass measures the number of atoms in an object, combined with the density of those atoms. Mass isn't the same as size, though. For example, a helium balloon is much bigger than a lead bullet , but it's also lighter and less massive. Weight , on the other hand, measures the pull of gravity on an object. On Earth, mass and weight are closely related. More massive objects tend to weigh more. Weight changes if the amount of gravity pulling on an object changes.
Take yourself, for example. If you weigh pounds on Earth, you would weigh only That's because the moon's gravitational pull is significantly weaker than Earth's. Your mass would remain the same. Your weight , however, depends on gravity and would be significantly smaller on the moon.
What's the deal with that? For the answer, we have to travel back to ancient Rome. The ancient Romans gave the name "Libra" to a constellation they thought looked like a pair of scales.
The astrological sign Libra took its name from this constellation. When the ancient Romans referred to weight , they used the term libra pondo. Libra meant " weight " or " balance scales," and pondo meant " pound. It's just one of the mysteries of language!
Are you ready to learn more about weight? Find a friend or family member to help you check out the following activities:. Try reading through this Wonder one more time - the answer can be found in the last four paragraphs! Hey Wonderopolis I was reading but for lb it reminds me of P.
Ps I like this story Signed Royce Smart at math ps 2 my fav book in wonderapolis is that kind of lizard that can walk on water reminds me of the song I can walk on water I can fly! Thanks for sharing, Royce! How Does the Basilisk Run on Water? Right on, Michael. Sounds like that takes a lot of strength. Glad we were able to help solve that one for you, Lucas! It's a random one but a good question. Salutations to you as well, Bettie! We ask that Wonderopolis be listed as the author.
Since we do not list the publish date for our Wonders of the Day, you may put the date you accessed this page for information. Accessed 12 Jan. It is pretty strange sometimes where our modern words came from. We're glad you joined the discussion, Raquelle! We hope you'll head over to our Wonders page to find another Wonder to explore! Thanks for sharing your opinion about this Wonder, Tavia.
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Help spread the wonder of families learning together. Is there a space between the number and LB? How did lbs become Pounds? What is lbs full form? What does LBS stand for in text? What does lbs mean on social media? What does IBS mean in texting?
What IBS stand for? What is the abbreviation of IBS? What does IB stand for on Tiktok? What does Fyp mean in texting? Is Adopt Me game getting hacked? What is the rarest rattle in Adopt Me? It's an odd choice, since they don't have any letters in common.
Or what about ounce shortened to "oz. To find out it requires a trip through English language history. The word "pound" comes from ancient Roman when the unit of measure was libra pondo , which meant "a pound by weight. However, the abbreviation "lb" is derived from the libra part of the word.
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