u/FingerAccurate7102

Under the post about dividing the day into 10/100/100 parts, many people said "second is the metric unit of time" and I agree, but what if we would made decimal time using seconds?

The idea is: keep the old second, but add SI prefixes

We want equivalents of minute and hour so I suggest:

Hectosecond (hs)

Kilosecond (ks)

Megasecond is too big (~2 weeks) and metric wiki fandom (yes it exists) suggested myriasecond as an new hour, but

1. It divides day into 9 parts and with 10 parts, some people said that they need smaller denominations

2. Myria- isn't a SI prefix

So hectosecond and kilosecond are still my types

There are pros:

1. It's decimal, and metric fans like decimal units

2. Hour wouldn't be a problem ever again:

km/h? Now its km/ks which is exacly m/s

kWh? Now it's kW•ks or exacly 1 MJ etc.

I still suggest using unit "day" until the moment that humanity will colonize the solar system, when "day" would mean nothing for people from Mars, but for today it's pretty useful

Of course there are cons:

1. Day splited like that would have 86,4 ks, with is not terrible number, but it's still not round, so it's kinda problematic I guess

2. 24/60/60 survived for thousands of years

3. 10 and 100 doesn't have as many divisors as 60 and 24

So I'm not sure is it a good idea or not

So what do you guys think? Should we use second as a base and then add prefixes, or keep 24/60/60?

In SI system (and units allowed to use) we've got 4 units of power:

Watt

Volt-ampere

Var

Kilowatt-hour per 1.000 hours

They have exacly the same value [kg m^(2) s^(-3)] but they are use for diffrent powers

Watt — active power

Volt-ampere — Apparent power

Var — reactive power (it's name is a shortcut of "volt-ampere reactive")

(Kilowatt-hour per 1.000 hours is used in Europe for electronic/electric devices)

And it's crazy, we could just use watt for everything, but we've got 4 units.

We can at least Justify first 3 of them, insted of writing which power are we talking about, we can use diffrent unit and every engineer knows what power are you talking about, but it's not exacly true, because all of them [diffrent powers] have diffrent symbols.

kWh/1.000 h is crazy, why not simple watt, here I don't even know how to justify it

What do you think guys? Shoud we use all of them, keep only few or use one unit of power (watt)?

The idea of metric time was an idea of changing the system of time to divide:

Day into 10 decimal hours (8 640 s)

Decimal hour into 100 decimal minutes (86.4 s)

Decimal minute into 100 decimal seconds (0.864 s)

And it looks good.

Someone will say: "second must be that length, because it is perfect for counting"

No it isn't, I never counted to 10 in 10 seconds.

But I have a few suggestions:

1st. Rename decimal second to something shorter like "decsec" and make it a base unit

2nd. Add myria- prefix for 10⁴ to replace decimal hour with myriadecsec. Myria- was actually a prefix till 1960. Add 10⁵ prefix, I guess lakha- would be cool, but I'm biased towards calling it insta- (because quintal would be instagram) and day would be just lakhadecsec. (But calling it a day it's also ok) Also decimal minute would be hectodecsec

3rd. Do NOT make a week 10 days. 1st - it would make work harder, because nobody will give you 6 days of work, and 7-3 scale is too much. 2nd - every 7 day it's sabbath.

4th. Move calendar by 6 years. Jesus was born ~2032 years ago, not 2026. And it makes a weird paradox, where everybody says that Jesus was born in 6 BC, but also everybody says he died in 33 AD, but he was 33 when he died, so it really was 27 AD

So what do you think? Should we rewrite time to 10/100/100, or keep it 24/60/60?

In our world in some places we still don't use metric units. Which is already bad, but most of units have at least some logic and intuition behind them, which at least partially defends it's use. For example:

Land mile is 2000 steps, sometimes I (as an European) use it for measuring steps easily

Nautical mile is 1' of earth circumstance, I can imagine someone using it

Kilogram-force is weight of 1 kilogram on earth, sometimes I use it for measuring weight and pressure (1 kgf/cm^(2) ≈ 1 atmosphere)

Bar is approximately equal to regular Earth atmosphere, so it's kgf/cm^(2) but for those working with pascals

But calorie? It's defined as the energy needed to raise the temperature of 1 g of water by 1 °C. Which is absolutely meaningless. WDYM I need to eat 2000 kcal everyday? So I can have energy to heat 2 megagrams/tonnes of water by 1 °C? Nice to know because it is exactly what I'm gonna do today.

Even Joule is more logical as it's based on distance and force, so I guess it could be interpreted in some way.

Summarizing:

Other non-scientific units are at least intuitive

Calorie isn't

Even Joule would be better

So calorie is dumb at least if your not a kettle

Of course, if you think otherwise, feel free to share your opinion. Bye!

Before I start I wanted to specify that this post would probably change absolutely nothing.

Kilogram is annoying, it's the base unit of SI, but for some reason it has a prefix. It is annoying, because with different units the prefixes work with a cool perk:

If one unit has a prefix, it is moved to the answer: kJ/s = kW

If you are multiplying two units with prefixes, they multiply: kW•ks = MJ

Dividing divides them (obviously): kJ/ks = W

But when base unit has a prefix it doesn't work, and kg•km/s^(2) should be meganewton, but it's NOT, it's kilonewton.

I have a few purely hypothetical ideas:

1st (most obvious) use grams. It would mean that the unit of force would be g•m/s^(2), problem: it would be equal to 1 mN, which is incredibly small, human weighting 700 000 force units would be really small. I'm not even gonna start talking about density with g/m^(3).

2nd use tonnes. This means that the unit of force would be derived as t•m/s^(2), so it would be equal to 1 kN. There are pros, like: 1. Good for heavy industry, for example: Poland mines 43 million tonnes of coal (instead of billion/milliard kilograms) the weight of a car would be ~15 force units. 2. Density of water is 1 t/m^(3) which is cool to have a base unit of density to be equal to density of water, also we could stop using g/cm^(3). But there are cons: tonne is too heavy for everyday life. Human would weight 70 mt (militonne) or 7 ct (centitonne), a slice of bread would weight 40 μt (microtones), so tonne is good for heavy industry, but if you don't want to use mili and micro prefixes, it isn't that great (still not that bad)

3rd grave, grave is suggested unit of mass equal to 1 kg, it was almost accepted, but then they realized that graf is German noble title. There is no nobelty today, so grave would work. It has all pros of kilogram + perks of being a unit without prefixes, so kilograve•km/s^(2) would in fact equal MN (meganewton). It's also good, because all other units can keep their names, grave•m/s^(2) is still 1 N. Let's make a symbol for grave "gv" 1 t = 1 Mg = 1 kgv. 1 kg = 1 gv. 1 g = 1 mg

What do you think guys? In perfect system we would use kilograms, or replace them with grams, tonnes, graves or something else. Share your opinion in the comments

Kilowatt-hour is a unit of energy equal to the energy produced by 1 kilowatt of power in one hour of time. It's completely idiotic, because the unit of energy is joule, where joule is newton times metre or watt times second. Let me give an example, for why using kWh over MJ (megajoule) is dumb:

Distance:

Let's use kn (knot, nautical mile per hour, 0,51(4) m/s) as a unit of velocity. Let's assume that steam ship Anne moves with velocity of 50 kn. This boat moves for 1 day. Now calculate the distance. Normal people will say that 50 kn = 50 M/h and 1 d = 24 h therefore 50 kn × 1 d = 50 M/h × 24 h = 50 M × 24 = 1200 NM. But with kWh logic it is: 50 kn × 1 d = 50 knd (knot-day). If you think knot-days are dumb, accept that kilowatt-hours are also dumb.

Reading posts on r/metric I found intresting that many redditors here hate tonne.

Tonne (A.K.A. metric ton) is a unit of mass equivalent to 1 000 kg it's legal to use in SI.

The point that tonne-haters make against the tonne is that tonne is equal to megagram, so this unit is useless.

I'm not a tonne-hater, I sometimes use tonne for big numbers of mass and here are some points to defend the tonne

1. Tonne is more understable.

As first Polish dictionary would describe it "everybody see what is a tonne" Tonne is useful in describing huge amounts of mass and many more people knows what is a tonne than what is a megagram. You can also add prefixes to tonne, to make the mass even bigger and the same as many more people knows tonne but not megagram, many more people know what megatonne is, rather than teragram. So tonne is useful if we want to make your work easier to understand for "the rest of the world".

2. Agriculture and quintal replacement.

In agriculture there is a unit called "quintal" which is equal to 100 kg, but it isn't legal unit in SI system, quintals are used by farmers, because they are big enough to give smaller numbers than kg, but small enough to give more precise numbers than Mg. As quintal isn't legal, it was replaced with "decitonne" (deci + tonne) so tonne is useful in agriculture. (Yes, SI could just legalize Quintal or make 10^(5) prefix, but still in modern SI it's the only way to use 100 kg units)

What do you think? What are your reason to like/dislike the tonne?

1st space after unit

You should type a space between the number and the unit. For example: 315 kg instead of 315kg, but also 20 °C instead of 20°C.

2nd Volume

Litre isn't actually the unit of volume in SI, the cubic metre is. Litre is allowed to used, but not the SI unit, 1 L = 10^-3 m³. Also don't mess the conversion, 1 m³ = 1 000 dm³ not 10. The difference is also cubed. Back to litre, both lowercase and upper case "L" are allowed as its symbol, so both 10 L and 10 l are correct

3rd lowercase

You aren't supposed to write the units with capital first letter even if the symbol is capital. For example 1 Mg is megagram, not Megagram and 1 J is joule, not Joule.

4rd hectares

Hectare (ha) is not SI, SI-allowed unit of area. 1 ha is equivalent to 10⁴ m² or 1 hm². It sounds like a unit with a prefix (hecto-are) but it's officially not (it was defined as 100 ares, but in SI it is an independent unit), "are" is a different unit allowed in SI. Hectare was originally based on are but officially it's not an are with a prefix. As hectare doesn't officially have a prefix you theoretically can make abominations like "kilohectare" but it's almost never used and I don't recommend them.

5th temperature

It's more known fact than the others but the unit of temperature is actually called kelvin, not degree Kelvin, so there is 303.15 kelvins outside, not 303.15 degrees kelvin. So don't make that mistake. Kelvin is the same as degree Celsius, so if the temperature is raised up 1 K is also raised up 1 °C, the only difference is 0 where 0 K is absolute 0 (-273.15 °C) and 0 °C is water freezing temperature in 1013 hPa so 273.15 K. Also you can add prefixes to K and even °C, so 100 K being 1 hK or 1000 °C being 1 k°C is actually legal, but not usually used especially for degrees Celsius.