A simple physics riddle that confused many people.
[otw_shortcode_tabslayout tabs=”2″ tab_1_title=”Simplified Chinese” tab_1_content=”晚上，我们全家在客厅看电视。忽然，爸爸笑着对我说：「小明，我想问你几个问题，你需要快速准确地回答。好吗？」我很自信。我是个五年级学生，有什么问题不会回答呢？
爸爸问：「一公斤棉花和一公斤铁，哪个比较重？」我快速回答：「当然铁比较重。」妈妈和姊姊都笑了起来。我觉得我回答错了。爸爸再对我说：「注意。我说的是一公斤棉花和一公斤铁，所以它们一样重。」
爸爸又问：「那么，一立方米棉花和一立方米铁，哪个比较重？」这次我特别注意爸爸说的话了，回答：「一样重！」大家又笑了。我想了想，发现自己又回答错了。「这次是铁比较重。」
爸爸又问：「一公斤棉花和一公斤铁，哪个体积比较大？」我受了两次的侮辱，在心里想了一下。「棉花体积比较大！一公斤铁的体积很小，一公斤棉花的体积真的很大。」大家听了，满意地笑了。
爸爸说：「不管是什么问题，都要认真思考。我刚问你的问题都是很简单的问题，但是因为你觉得简单，你就不认真回答，结果你回答错了，被别人笑了。」
我点点头，记住爸爸的话。
” tab_2_title=”Traditional Chinese” tab_2_content=”
晚上，我們全家在客廳看電視。忽然，爸爸笑著對我說：「小明，我想問你幾個問題，你需要快速準確地回答。好嗎？」我很自信。我是個五年級學生，有什麼問題不會回答呢？
爸爸問：「一公斤棉花和一公斤鐵，哪個比較重？」我快速回答：「當然鐵比較重。」媽媽和姊姊都笑了起來。我覺得我回答錯了。爸爸再對我說：「注意。我說的是一公斤棉花和一公斤鐵，所以它們一樣重。」
爸爸又問：「那麼，一立方米棉花和一立方米鐵，哪個比較重？」這次我特別注意爸爸說的話了，回答：「一樣重！」大家又笑了。我想了想，發現自己又回答錯了。「這次是鐵比較重。」
爸爸又問：「一公斤棉花和一公斤鐵，哪個體積比較大？」我受了兩次的侮辱，在心裡想了一下。「棉花體積比較大！一公斤鐵的體積很小，一公斤棉花的體積真的很大。」大家聽了，滿意地笑了。
爸爸說：「不管是什麼問題，都要認真思考。我剛問你的問題都是很簡單的問題，但是因爲你覺得簡單，你就不認真回答，結果你回答錯了，被別人笑了。」
我點點頭，記住爸爸的話。
“][/otw_shortcode_tabslayout]
English translation:
In the evening, our family was watching TV in the living room. Suddenly, my father smiled and said to me, “Xiao Ming, I want to ask you a few questions, and you need to answer quickly and accurately, how about it?” I am confident. I am a fifth-grade student. What questions can’t I answer?
Dad asked, “Which one is heavier, one kilogram of cotton or one kilogram of iron?” I answered quickly, “of course iron is heavier.” My mom and sister laughed. It seemed that my answer is wrong. Dad said to me again, “Be careful. I’m talking about one kilo of cotton and one kilo of iron, so they weigh the same. ”
Dad asked again, “So, which one is heavier, one cubic meter of cotton or one cubic meter of iron?” This time I paid close attention to what my father said, and replied, “They weigh the same!” Everyone laughed again. I thought about it and suddenly I found myself answering the question wrong again. “This time, the iron is heavier.”
Dad asked again, “Which volume is bigger, one kilogram of cotton or one kilogram of iron?” I have received humiliation twice and thought about the question. “The volume of cotton is bigger! The volume of one kilo of iron is very small, and one kilo of cotton has a big volume.” Everyone listened and smiled with satisfaction.
Dad said, “No matter what the problem is, we should think carefully. The questions I just asked you are all very simple, but because you thought they are simple, you didn’t answer them seriously. As a result, you answered wrong and got laughed at by others. ”
I nodded and kept Dad’s words in mind.
Photo source here.