/u/Chainweasel's posts in /r/askscience

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How does a digital camera know it's in focus?

12 upvotes

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If helium balloons float upwards because it's less dense than air, shouldn't a container under vacuum also be lighter than air? Could you make an airship float using vacuum if you had a material light, yet strong enough to not collapse on itself?

10 upvotes

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My electricity just went out during a storm, why did my fans shut off a noticeable amount of time ( around 5 seconds) before the other electronics in my house?

1 upvotes

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If you decompressed like a diver after surfacing, could you survive in a vacuum with only a breathing apparatus?

1 upvotes

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If it takes uranium ~4.46 Billion years to decay into lead and the Earth is ~4.54 Billion years old, how is there any usable amount of uranium left on Earth?

1 upvotes

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How small can a gas planet be?

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The weather reports often say the total amount of precipitation is far less then what we actually get, am I reading it wrong?

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If I were stranded on a deserted island, how far from the beach would I have to dig before I found fresh water?

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What would the worlds climates look like if the Earth's axis was at 0° instead of 23°?

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[Physics] What really happens to something that approaches the speed of light?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How does a digital camera know it's in focus?	12
If helium balloons float upwards because it's less dense than air, shouldn't a container under vacuum also be lighter than air? Could you make an airship float using vacuum if you had a material light, yet strong enough to not collapse on itself?	10
My electricity just went out during a storm, why did my fans shut off a noticeable amount of time ( around 5 seconds) before the other electronics in my house?	1
If you decompressed like a diver after surfacing, could you survive in a vacuum with only a breathing apparatus?	1
If it takes uranium ~4.46 Billion years to decay into lead and the Earth is ~4.54 Billion years old, how is there any usable amount of uranium left on Earth?	1
How small can a gas planet be?	1
The weather reports often say the total amount of precipitation is far less then what we actually get, am I reading it wrong?	1
If I were stranded on a deserted island, how far from the beach would I have to dig before I found fresh water?	1
What would the worlds climates look like if the Earth's axis was at 0° instead of 23°?	1
[Physics] What really happens to something that approaches the speed of light?	1