joule
US /dʒul, dʒaʊl/
・UK /dʒu:l/
A1 初級
n.名詞焦耳
影片字幕
宇宙最強大的力量 The Most Powerful Objects in the Universe
25:07
- James Prescott Joule built an apparatus that demonstrated this principle. It had a weight
詹姆斯-普雷斯科特-焦耳製造了一個證明這一原理的儀器。它有一個重量
- That led to one of several basic energy yardsticks, called a joule. It’s the amount needed to
這就導致了幾種基本能量尺度之一，稱為焦耳。這是一個需要量，以
懶惰的進化：人類為何抗拒健身 | 丹尼爾-利伯曼：訪談全文 (The evolution of laziness: Why humans resist the gym | Daniel Lieberman: Full Interview)
13:32
- You know, if you wanted something to eat, you had to go find it. You had to either, you know, hunt it or gather it or dig it up. And so energy was limited. And when energy is limited, you have to engage in trade-offs, right? And so if you spend energy on physical activity, that means you're not spending energy on taking care of your body or reproducing, which is what the only thing natural selection really cares about. And so the fact that our bodies are so expensive helps explain why we tend to avoid unnecessary physical activity. Because it prevents, you know, like for example, this morning I went for a 5-mile run. So I spent about 500 calories. Those are 500 calories that I could have spent on my metabolism. And if I were energy limited, that would have been a bit of a problem, right? Which is why people who are energy limited and already physically active, it makes no sense for them to go for a needless, completely pointless 5-mile run in the morning. So technically, a calorie is the amount of energy it takes to raise one gram of water one degree centigrade. So it's a unit of energy. And so we convert various kinds of energy into calories. There are, of course, other units of energy, like the joule, for example. But calories are kind of a useful one because our food is labeled in calories. So a calorie is the most common one. But actually, the calories that we mostly talk about that are on our food labels are actually kilocalories. They're actually 1,000 calories.
你知道，如果你想吃點什麼，你就得去找。要麼去打獵 要麼去採集 要麼去挖掘所以能量是有限的當能量有限時，你就必須有所取捨，對嗎？是以，如果你把精力花在體力活動上，就意味著你沒有把精力花在照顧身體或繁殖上，而這才是自然選擇真正關心的事情。是以，我們的身體如此昂貴這一事實 有助於解釋為什麼我們傾向於避免不必要的運動因為這樣可以避免，你知道，比如說，今天早上我跑了5英里。所以我消耗了大約 500 卡路里。這500卡路里本可以用於新陳代謝。如果我的能量有限，那就有點麻煩了，對吧？這就是為什麼那些能量有限，但身體已經
為什麼壓縮空氣罐會變冷？ (Why Do Compressed Air Cans Get Cold?)
06:12
- thermodynamics without the huge time commitment it would take to learn enough about Joule-Thompson
熱力學，而不需要花費大量的時間來學習足夠的焦耳-湯普森知識。
14 分鐘內講解所有物理知識 (ALL OF PHYSICS explained in 14 Minutes)
14:20
- Energy has the unit joule, and it's not like force, it doesn't have a direction, it's just a number that's kinda chill in there, as a property of a thing.
能量的組織、部門是焦耳，它不像力，沒有方向，它只是一個有點冷冰冰的數字，是事物的一種屬性。
- For example, if you lift an apple by 1 meter, you would have done about 1 joule of work.
例如，如果你把一個蘋果舉起 1 米，你就做了大約 1 焦耳的功。
