just put butter in the toothpaste tube smh

this advice is specifically about sulfuric acid. it’s denser than water, so if added to it it will sink diluting itself along the way, while also heating water around and making it float to the surface. if done opposite way, water won’t mix immediately because of large density difference so neutralizatio heat will be deposited on surface between these two boiling water and throwing acid around. this matters less with other acids because less heat is deposited, and in some cases acid is less dense than water. but if you stir the acid quickly, you can do it either way as long as you control temperature. this also is the case when you need to mix two different acids

tldr you can do whatever you want as long as you know what are you doing

e: i’ve checked and heat of dilution is greatest for sulfuric acid, liquid HF is similar per gram, gaseous HCl and HBr are half of that per mol, other common acids 5-10x less esp as aqueous solutions and not neat. also the same happens when diluting acids with other solvents, like alcohols or ethers, these might be even worse because they boil at lower temperature

speaking of oracle, they recently loaded up on debt and got into deals that are all but impossible to fulfill, and in a couple of years their survival will depend on openai making profit. (not revenue) put a pin in it and come back to that in a year or three

openai will listen to it too

i guess the apparent intention was so that it can be listened to, instead of read. the actual intention was to get money from the same type of person this appeals to

this is not something unusual, it’s like saying “how china’s manufacturing industry fuels microplastic crisis”. it so happens that manufacture of many APIs (active pharmaceutical ingredients, especially generics on account of lower profit margin) got over time outsourced to china and india. what else do you want? cut off entire countries from opioids import? there are legit importers everywhere and it’s that countries’ regulators/customs/etc job to figure it out

technically pv panels are also heat engines. this is why they need cooling

the steam part is in the rest of hydrological cycle

I suspect that we’ll see these “rockets” (missiles?) used for ground based air defenses before too long.

there’s already a ground based launcher for APKWS and FZ275 is compatible with it too

No not really. APKWS or JDAM are retrofits of old weapons with new guidance package. Belgium has no large stockpile of old unguided weapons so they get to design the entire thing from ground up. The principle is similar, its a laser guided beam riding missile shot from a heli or a jet, but APKWS sensors are on leading edge of winglets and this new thing has sensor in nose like a tiny Stugna. overall drop-in APKWS replacement with 10k manufactured per month target

breaking news: fork found in kitchen

that mmwave radar would have to be attached to a drone, because their manned aircraft are unbelievably obsolete. it means smaller size meaning low resolution, and as starlink emits pinpointing them would be very easy when active, much easier than any passive sat dish, and starlink is still in use. i’ve seen some advice on hiding starlink that includes turning off starlink wifi and using wired connection, because irgc is looking for 2.4 ghz signal (from ground?) and not for 14-ish ghz uplink, so they probably dont have a lot of flying ew/radars

i’m not saying that iranian air force has definitely none of that, but i would be decently surprised if they do have more than 2

there are ways. for example, put a fake hot water barrel on the roof, made from fiberglass or polypropylene or what have you, but not metal, and put dish inside, or in any variety of inconspicuous containers or boxes made from plastic or wood or fabric. some other antennas can be camouflaged as fake chimneys or gutters or water piping or many other things

quixotic, even

Stirling engines are woefully inefficient tho, PV panels are better unless you’re intending to supplement heat source with biomass or such. In a climate where most of energy is used for heating and little to none on AC, it just makes more sense to use solar collectors instead of PV because most of energy use will be in form of heat anyway, and per square meter collector will deliver much more. If you can couple excess heat production to seasonal energy storage, this gets you most or all of heat needs year round covered by solar, if you don’t there’s still free hot water in the summer and seriously lowered gas bill through the year. Small PV panel might make sense to keep pumps running or cover some of the rest of needs but won’t shift balance heavily either way. In a place where major use of energy is AC this approach makes no sense and PV panels with daily or a bit longer lasting storage of energy, be it in batteries or thermal (tanks of cold glycol or ice or whatever) would be the way to go, because the most sunny day is also the day when you need AC the most and this way you get most of your energy needs covered

i heard a story about varnish factory that failed quality checks after one old guy got fired, he was a smoker and used to spit in the main reactor. some enzyme from saliva made it shinier

it will vary, just after distillation (or RO/ion exchange) it should be closer to 7 then it goes down as carbon dioxide gets absorbed. that’s why it’s buffered everywhere where it matters

in my case the size of the system was so small they didn’t have that excuse, yet they were only ever able to get correct results after experimental data was handed over to them, zero predictive power, useless

seeing that jargon file has an extensive page on retrocomputing feels like figuring out that there were archeologists in ancient egypt

some people would tell you that we can simulate small bits of chemistry but it’s flat out wrong (i might be biased as i’ve wrangled for a year with computational chemists about results that don’t conform to reality) and even then errors are so large that’s it’s useless