Which is heavier - 1kg of lead or 1kg of cotton?

Surely you have heard the question "What weighs more, a kg of lead or a kg of cotton? This question is used by teachers to teach young students a clear difference between mass, volume and density. A kilogram is a unit that is used to quantify masses and therefore both kilograms will be equal; what really varies is the volume, since, a kilogram of lead could easily fit in our hands, while a kilogram of cotton could be 10 pillows, this is due to their densities that are very different.

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44 Comments

Robert Oldenburg

A question that common a stream of goofy questions such as “if a rooster lays an egg on the tip of a roof which way will it roll?”

Conrado De Leon

Reminds me of a Mutt & Jeff cartoon, where Mutt asks Jeff the same question. Next, Mutt comes out ogf his house and a pillow falls on his head. He looks up, and Jeff's voice says: Now I'll drop the pound of lead... LOL

Pat Salloum

A riddle I first heard as a child...but then it was tons of feathers and lead.

Wayne Roberts

This is a kids question! Stop insulting us!

Shirley Dutt

A kilogram is a kilogram, no matter what is being weighed.

Mike Hibner

No one should ever give the wrong answer to this question...

Player

A kilo is a kilo is a kilo.

Bob

They have the same mass, but lead apparently weighs more because of the upthrust of the surrounding air.

Bank-Robber

I knew it had to be a Lilly Question!!!

Judy Susag Cardwell

Wow I can't believe how many wrong answers on this one

Jerry Edwards

Come on children... Keep up!

Joanne Serin

12.6% were thinking!

Joanne Serin

That's an old joke.

Armando Garciacano

Actually the question was with 1 lb of gold and 1 lb of cotton. Gold is weighed in Troy ounces which is heavier than regular cotton ounces. So do the calculations. Ha ha !!