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Actually my ebike is still miles. Miles = moving parts.

Motorcycles in the US are also miles im 95% sure. You will see hours on things like tractors I believe or ATVs, even watercraft.

It’s really hard to gauge the overall health of a vehicle via one metric. Just because the car has 5000 miles on it doesn’t mean the previous owner didn’t do them all at 6,000 rpm in second gear for all you know.

This is also part of the reason quality electric cars have decent resale value after hundreds of thousands of miles at times; the drivetrains have many less moving parts than internal combustion engines, so the overall health of the vehicle is suspect to much less “witchcraft”.

Wrong.

A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid.

They are different things. A furnace is just the source of heat. It could je a single wall mounted unit or it could be the heat source for a central system. And could be a gas furnace or an electric furnace even. The furnace is the heat source used in multiple types of heating systems.

>Tires shocks and brakes all of these other things are usually repaired within a certain cycle of mileage, but the major indicator trying to figure out if a 50,000 mi which car versus 150,000 mileage car, could be incredibly different if I lived in a very urban area and perhaps sat in my car with the engine running for several hours. I'm just confused why this never was taken into account but it seems like from one of the answers that this is kind of just been the de facto standard and hasn't really ever been updated.

Highway miles are easier but only a little and it still depends on soo much. A car with 60k miles driven on a nice highway may be in better condition than one with 50k driven in the city but one with 50k driven on crappy bumpy highways may be in worse shape than the one with 60k city miles in a place with nice roads and no salt. A car with 100k highway miles is still wayyy closer to the end of its life than one with 50k miles of any variety

Each bump, vibration, start, and stop stresses various systems. Highway speeds are easier on the engine and transmission because they're staying in their happy zone but higher speed bumps are harsher on the body and suspension.

The mileage is just a guideline as higher mile cars are in general closer to the end of their life, but you really can't capture all the little differences which is why there's also a quality grade for the condition of the vehicle and you should get it checked out.

You fundamentally cannot make a perfectly accurate pricing tool for cars, there are wayyy too many variables for someone to punch in which is why you generally get a price range and there's a qualitative assessment after that.

Eli5 answer: you see the cake, not all the ingredients that went into said cake, the heat incorporated into it to make all the parts work, etc. You just see the final product.

As a fullstack dev i feel uniquely qualified to answer this question. You only see some of the site. There is lots of code that run server side on the backend that you have no access too. For example, an Ajax call that sends data to the server in order to add or retrieve data from the database. You can't see that code, only what is sent over. Things can get even more complex when you start mixing in APIs and other services outside of the main server.

Also you cannot see the structure of the database either. You can infer, but not copy it exactly. Websites are a lot more than just what you see and is a common complaint of backend devs that don't get as much recognition as front end devs because a lot of there code and contributions are not as visible to non tech people.

All liquids are fluids

Of course, yes. But those same factors affected older cars as well. Peak efficiency in lab engines is higher now than it was 20+ years ago, and efficiency in terms of real life use is also higher now than it was 20 years ago.

Hybrids start to bridge the gap with regenerative braking, but then of course its not purely an ICE vehicle anymore. Technically if its not a plug-in hybrid then all of the energy used came from the ICE, so you could argue that its an ICE vehicle with additional efficiency technology installed. That addition alone significantly improves the efficiency in terms of miles per gallon (or equivalent metric), but doesn't alter the thermal efficiency of the engine itself.

This is clearing things up for sure. Don't motorbikes or bikes get rated by hours used? But yes I'm beginning to understand this better.

Maybe partial logic is that a majority of cars have a balanced average amount of highway versus Urban miles?, And that this metric is in fact truest in the sense of modern technology too?

Sorry my articulation is a little fuzzy today.

You can steal the visual portion of it. The portion that makes it actually /do/ anything is on the server and not visible to the client.

i believe in ADHD the reduced levels of norepinephrine refer to the role that that neurotransmitter has in the brain connectivity, it doesn't refer to the systemic effects of adrenergic peptides (adrenaline and noradrenaline)

Yep, absolutely. Air compressors for air suspension can take a fair amount of power, heated windscreens, the list goes on.

A fluid describes something that can change shape to match the shape of its container, and can move.

A gas (like air) is actually a fluid, it can flow down a pipe just like liquids can.

The difference is gas expands to fill its container, while liquid only takes up a set amount of space. A glass half full of water will stay half full. If a glass was half full of air, the air would spread out to fill all of it with less-dense air.

A "fluid" is something that flows.

All liquids are fluids, not all fluids are liquids. Gasses are fluids too.

While what you say is true, mere idling won’t put as much strain on the chassis, cables, suspension, transmission, etc.

Less parts moving = less wear usually, so the metric will hold as well as it can. I suppose you could rate it in hours, like an industrial machine, but that would be a sketchy metric as well. Did you just turn the key, or was the engine running?

Both liquids and gases are fluids. That is the difference. Gas is a fluid, but not a liquid. All liquids are fluids, but not all fluids are liquids.

Wow thank you! Are furnaces & central heat different?

It's not really about the size of the country so much as how the infrastructure and cities are put together.

I haven't lived in a household that owned even a single car since the late 90s. We build our work and homes denser and closer together. So for a lot of things I can walk, and for everything else in and near the cities there's busses and trains everywhere.

Basically your culture choose to make you all dependent on commuting in cars. Mostly via the power of letting corporations decide for you.

It's just more profitable for them this way, you have to pay for the cars and the fuel and parking and the roads and the insurance and health care (because cars injure and kill soooo many people). And they profit from all of it. And they use that profit to fund politicians who promote and support it all.

Right, so the part that confuses me is that we can look at mileage and say oh it had every 5,000 miles or 3,000 miles another oil change but this literally does not take into account the fact that this car could have sat idling for many many hours very often. And there is no metric to determine engine output. It just seems like a vital detail that is missing.

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No one, that’s why they’re engineered like I said now.

Now I'm curious. I know gases can be modelled as fluids but I'm curious about non-fluid liquids...

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Thanks, I'll keep that in mind.

I think this is the answer I'm looking for. Basically, it could be useful but we just stuck with it. Thank you for your response.