What weighs more: 1 kg of iron or 1 kg of feathers?

eBook (PDF), 164 Pages
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Price: $8.32
Once, when I was still a child, my father asked me: “Which weighs more: 1 kilo of iron or 1 kilo of feathers?” I remember that sure of myself I answered him quickly: “Surely 1 kilo of iron weighs more, dad, because metal things, like the armor of medieval knights, are very heavy, while the feathers that decorate birds’ wings are very light”. I can’t tell you how disappointed I was when I heard him say: “No my son, that’s wrong: they weigh the same, because 1 kilo is always 1 kilo!” Maybe because of the evening trick questions from my dad, when I grew up I decided to become a physicist, and to my big surprise I discovered that I was right when I was a child. Indeed: On the Earth, even if only by a little, 1 kilo of iron weighs more than 1 kilo of feathers! Don’t worry, the sawdust that I have in my head has not caught on fire! But I hope that I have made you curious and that now you will want to come hunting with me for this... More > strange and heavy mistake.< Less
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Product Details

First Edition
November 15, 2012
File Format
File Size
2.21 MB
Product ID

Formats for this Ebook

Required Software Any PDF Reader, Apple Preview
Supported Devices Windows PC/PocketPC, Mac OS, Linux OS, Apple iPhone/iPod Touch... (See More)
# of Devices Unlimited
Flowing Text / Pages Pages
Printable? Yes
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