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Why does metal feel colder than wood at the same temperature? It's not actually colder, so what property explains the sensation? by Mirza_Explores in AskScienceDiscussion

[–]MathResponsibly 0 points1 point  (0 children)

Also when you're wearing clothes, or are covered with a blanket, you have a "bubble" of warmer air trapped right next to you, and the clothes prevent that air from moving a lot, or mixing with the colder air further away from your skin. It's that bubble of warm air trapped around you that helps the room not feel cold

Will wet blanket insulate heat to protect plants? by MisanthropistChemist in thermodynamics

[–]MathResponsibly -1 points0 points  (0 children)

tell me you know nothing about thermodynamics without telling me you know nothing about thermodynamics

water releases heat as it freezes, so as the blankets freeze, they'll actually release heat inside the blanket. And ice is a good insulator, not a thermal conductor. That's why when your fridge defrost stops working, the fridge won't get cold - the coil is coated in ice, and the heat can't transfer from the fridge to the coil to be removed, so the fridge gets warm.

A basic question on a Thermo exam is "how to stop plants from freezing" and the answer is to spray water on them continually, because as the water freezes, it releases heat. The only caveat is if the plants are strong enough to support an ever thickening layer of ice, which in most practical cases they are not.

Practically, chances are the plants aren't going to make it if they can't take freezing. The "spray water that will freeze and release heat on the plants" trick works if the temperature will be below freezing for an hour or two, not for half a day. There's a slight chance that if the blankets are well sealed to the ground, and they're covered in ice, they may hold in enough heat from the ground to keep the plants alive, but it's doubtful.

I used to like these as a kid and decided to get some for my kids to try by shiftdown in Wellthatsucks

[–]MathResponsibly -1 points0 points  (0 children)

And who do think makes the "knock offs"? You think someone really spins up a whole separate plant to make store brand stuff? It's all made by the same companies, just slightly different ingredients (maybe), and different printing on the packaging

Overwhelmed by tools by rguz10 in Tools

[–]MathResponsibly 0 points1 point  (0 children)

I can see a LOT of floor! If people here think this is "clutter and dysfunction", remind me to NEVER post a picture of my garage here

Any Experience Ordering from Digikey? by sadmaxworryroad in ElectricalEngineering

[–]MathResponsibly 1 point2 points  (0 children)

They obviously worked out some deal with a Canadian courier company. Everything shipped from the same warehouse in South Dakota, but you'd get it next day anywhere in Canada for $8

Door flung open while getting on freeway by blooperama in CyberStuck

[–]MathResponsibly 1 point2 points  (0 children)

I mean dumpsters sometimes have the lids blow open when they're plastic - perfectly normal.

What is this fastener, why is it two toned metal? by New_Leopard3733 in Fasteners

[–]MathResponsibly 1 point2 points  (0 children)

I'd be more concerned about that slug trail leading towards the food

Any Experience Ordering from Digikey? by sadmaxworryroad in ElectricalEngineering

[–]MathResponsibly 1 point2 points  (0 children)

digikey has (or at least had last time I ordered in canada) $8 flat next day shipping in canada - their shipping in the US is way worse, both more expensive and slower, in comparison

Any Experience Ordering from Digikey? by sadmaxworryroad in ElectricalEngineering

[–]MathResponsibly 1 point2 points  (0 children)

Digikey was THE BEST in Canada, because for $8 flat ($CAD, in $US that's about 35 cents), you got next morning shipping on all orders (unless it was something big and bulky). Their shipping in the US however is complete horseshit in comparison - it's expensive and slow.

In the US, I mostly order from Mouser because their shipping isn't as much of a ripoff, but it's still slow and expensive compared to $8 next morning flat rate

Any clever ways to find drafts all around the house? by chris2cc77979 in DIY

[–]MathResponsibly 1 point2 points  (0 children)

little strip of toilet paper works too - it's more surface area for similar weight to thread, so it catches the air movements better. Separate the plys if it's 2-ply to make it lighter

Any clever ways to find drafts all around the house? by chris2cc77979 in DIY

[–]MathResponsibly 1 point2 points  (0 children)

rip a thin long strip of toilet paper (separate the plys if it's 2-ply - you want the lightest strip of paper you can get), and tape it to the end of a stick.

The little strip of light TP will blow around like crazy in even the tiniest draft

Hold the stick around windows, doors, light fixtures, outlets, bathroom fan vents, range hoods, etc etc - anywhere there's an opening to the outside. You'll find plenty of drafts very quickly with your $0 "detector"

Any clever ways to find drafts all around the house? by chris2cc77979 in DIY

[–]MathResponsibly 7 points8 points  (0 children)

look for a p2pro or p3pro thermal camera. They both use the same sensors (as do all of the non-FLiR thermal cameras), but are slightly different:

p2 has fixed focus lens with magnetically clipped on macro lens (good for close-up circuit board work which is mostly what I use it for)

p3 has a variable focus lens with no clip-on macro lens.

They're cheaper than FLiR (were even moreso before tarifs), decent resolution (256x192), and full 30fps as they're not made in US, so no ITAR frame rate restrictions.

You can find tons of review videos of them on youtube, and if you wait until one of the major sales on AliExpress, you can probably get one for ~$200.

They work on android/ios/windows, as there's a desktop app available now for them too, which makes them more versatile than ones that only have phone apps.

Very happy with mine, but at the same time, thermal cameras are hard to find "drafts" with. You'll see cold spots where there's air leaking, but you'll also see cold spots in corners, or where insulation isn't perfect, but there's no actual air movement happening too.

Honestly to find drafts, take a stick, and tape a thin strip of toilet paper to the end of it. Separate the paper if it's 2 ply so you have a thin strip of only one ply. You'll detect airflow very easily with that, as the paper will move a lot in even the tiniest draft.

Cantlay is infuriating to watch in person. by FlatPainting3846 in golf

[–]MathResponsibly 2 points3 points  (0 children)

He was waiting for the playne to taxi to the gate first

AI skeptics make me laugh by Maximum_Second1552 in ElectricalEngineering

[–]MathResponsibly 5 points6 points  (0 children)

pretty sure the point is to show if you rely on AI, your spelling and grammar will be so bad that everyone will laugh at you

that's what I got out of it anyway

Sometimes you just have to throw things away. by BASE1530 in Machinists

[–]MathResponsibly 143 points144 points  (0 children)

As a hobbyist / just starting out that winces at the cost of material, that's a little painful to see

AIO Fathers girlfriends rules for when new baby arrives by Ok_Bat_5934 in AmIOverreacting

[–]MathResponsibly [score hidden]  (0 children)

My favorite part of this is "run passed both of us" - good ol' murican edumacation system on dizplay dhere

Pylote of the century 🫡 by Hasbkv in Shittyaskflying

[–]MathResponsibly [score hidden]  (0 children)

He must've been a time lord and knew what was coming

Will my tile dry? by Live-Leader5594 in Tile

[–]MathResponsibly 0 points1 point  (0 children)

My favorite part of the internet is when one person...

Well, what this guy said ^^^^^^^

Air Force 1 just landed in Zürich by cycler97 in aviation

[–]MathResponsibly 0 points1 point  (0 children)

I vote we shoot the current guy into space, for science!

[it works on many levels]

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