Making a whirlpool and getting in the middle and jumping up and down making a wave pool were the funnest parts of an above ground pool

> like inertial

One method simply measures how long it takes light to go through a coil, and if the coil is rotating it will take slightly longer or shorter than if it isn't. Three coils perpendicular (orthogonal?) to each other and you know how you're moving. Run the long term results through a filter and you can determine your latitude as well.

(Technically it's two beams in each fiber going opposite directions and they compare the phasing).

https://en.wikipedia.org/wiki/Ring_laser_gyroscope

https://en.wikipedia.org/wiki/Fibre-optic_gyroscope

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Very cool. So many early (and even more modern types, like inertial and star-based navigational systems) measurement and navigational tools rely on extremely simple and primitive concepts or operations, but they produce such useful data.

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The metal housing wasn't the oven's housing, it was the housing of the part being heated, or at least that's what the OP typed grammatically. They may have meant something different. Either way the temperature delta wouldn't have anything to do with the heated air, it would just be thermal conduction if it was the interior of the oven wall that was cooler than the internal ambient air. Also, you can test this on your own very easily. Go try to use a thermal camera or IR thermometer on a shiny piece of metal. You'll receive obviously inaccurate readings. Place a piece of dark tape or paint on said metal and watch as the temperature is more accurately represented.

Edit: I'd also like to point out that this is inside of an oven. There is more heat being introduced to the system on a consistent basis to maintain a constant-ish temperature. If there was a hunk of metal inside that was still below the target temperature, it'll keep introducing heat. Preheat your kitchen oven empty and then with a cast iron skillet inside. The heat capacity is many times higher with the skillet vs just atmosphere.

Thanks for the clarification. It looks like there is no consensus on why the magnetic poles flip.

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> Just because air is flowing, doesn't mean it's cooling down the metal. Flow doesn't equal cooler.

Roughly speaking, flow equals better heat transfer. We're used to thinking that flowing air = cooler because we--our bodies--are usually warmer than the air around us. Even if it's hot enough outside that the air is warmer than we are, then we're probably sweating, so we have evaporative cooling going on--and flowing air makes that happen faster.

So, in our personal experiences, we almost always find that it feels cooler when air flows over us. It's really easy to over-generalize that and assume that it's a universal law.

You can easily test it at home, though. Get two little cups of ice, make sure there's the same amount of ice in each one, and then put a fan on one and let the other sit in still air. You should notice that the ice with the fan melts faster--the flowing air is heating it faster than the still air is heating the other ice.

You might also already have a device built around this effect: a convection oven or air fryer.

Heat cannot of itself pass from one body to a hotter body. If two bodies of different temperatures are in contact then heat will flow from the hotter body to the cooler body until the thermal energy is equalized. This will continue until the universe stops functioning.

I don’t think the flipping of the magnetic fields poles is at all related to the direction of Earth’s core. I don’t believe the core can change direction or has been asserted to have ever changed direction. I am sure it can slow down and probably speed up, though.

Baby elephants are like 250-300 lbs when born, that is much larger than all but the most massive outliers of the biggest breeds of dogs

The best way to think about thermal cameras is to think about cameras.

Imagine you are trying to measure how hot something is by how much it's glowing. For example you go to resistive coils and see how bright they get. You can get a decent measurement just by seeing how bright it gets. Now try to measure a mirror reflecting an image of the coils. You'll get a very similar measurement. Is this because the mirror is just as hot? No, you are mostly measuring the reflected image of the coils and not the mirror itself.

It's the same thing with thermal cameras. Metal is very reflective at the wavelengths used to measure thermal radiation. You are essentially looking at a mirror and will not get accurate readings from it in much the same way.

Tested and verified. Source I was a kid/teen with access to an above ground swimming pool.

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Everyone is saying that, but assuming the pool is an isotropocally scaled version of the cup, its energy scales with r^3, but the dissipation scales with S*v ~ r^2 * rw ~ r^3

Unless I'm too tired and missing something obvious this doesn't seem that simple

Edit : thinking about it for another minute I do believe I'm too tired after all, because I didn't take into account that the energy doesn't linearly scales with the volume, but rather in r^5 assuming constant angular velocity

And so r^5 >>> r^3 and the pool indeed triumphs over the cup

Your coworker is not correct, unless the item is evaporating a liquid like water or something. If it's completely dry, 105c air is going to bring the object up to 105c whether it's blowing or not, but if it's blowing it will actually be quicker because the cooled air from the object is being removed and replaced by new hot air

Even easier. Just use some masking tape.

Recommended up to 100c but I doubt 105c would be a problem.

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There's a big difference between a baby elephant and a scaled down adult elephant

Capton/polyamide tape works great! It has a very high emissivity, is super thin and can take high temperatures.

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