You got pretty mixed up. First: 1L of water is 1kg anywhere, because mass doesn't depend on gravity. And second: a liter is 1 cubic decimeter, the base unit is the meter. It could appear as a derived unit, the quizmaster just didn't feel like it
grantdon: that's just demonstrably false. There is no official spelling or pronunciation for liter, meter, or aluminum in SI, British and American English are both acceptable as are variations on these terms used in any other language, and the ones that you favor are not more correct or more international than any other variety. It's a little sad that this is what you're left with clinging to to avoid feeling insignificant.
I can't believe you just said that grantdon saying something random he thought was right has "left with clinging to to avoid feeling insignificant" I feel like that's a bit of a jump there
The unit of measurement for length is a metre…a meter is a device that measures a unit like an ammeter, voltmeter, pedometer, speedometer, odometer seismometer etc.
The meter has been defined as a ten millionth of an half meridian (which is why the circumference of the earth is so close to 40000km...). Then the kg has been defined as the mass of a liter (= cubic decimeter) of water at ambient temperature. Note that gravity has no incidence on that definition, but temperature has: density varies according to temperature, this is what is called thermal expansion. These concepts were not mastered around 1800 when the units were defined, which is why a liter of water is not exactly one kilogram at 20°C. Since 1875, the exact definition of the kilogram is... the international prototype kept in Sèvres. It's frustrating that we have not been able to find something better since then but it's like that...
On the other hand, the second has been given a precise and complex definition, based on the hyperfine quantum levels transitions of the atom of Cesium. Then, since the speed of light is a very precisely known physical constant, the meter is simply defined as the distance travelled by light in a 1/299,792,458 of a second.
...in a vacuum. Also, between 1960 and 1983, a meter was defined as "1 650 763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum."
Yeah, pretty much. I am only 13, but I know how time dilation works, and how to theoretically create a wormhole and how to time travel, which by the way, is impossible. You need to have a decent source of gravity with some exotic matter with negative mass in the middle and some kind of large, pulling force, such as a black hole, on the other side. But, since exotic matter and matter can't technically co-exist in the same plane of existence without creating a massive explosion producing 4.5e+35 joules of energy, depending on how much matter you pump into the equation, you would need an electromagnetic force keeping the individual atoms apart just enough that they don't spontaneously combust, but do their job and keep the time rift open.
Really??? I dont think abbreviations should be allowed. Then you should accept sec and gig newt etc. The question is where do these letters stand for, not what do these letters stand for, that stands for the correct names. (If you get what I mean)
I don't know where "here" is for you but in the UK, I have always been taught both orally and written as amps and then I was taught later that amp meant ampere.
Steradian is basically used to measure 3-dimensional angles.
Basically, take a sphere, draw a circle on it. Now, join the circumference to the centre of the sphere. That angle formed will be measured in steradians...
Just like and entire circle is 2π radians, and sphere is 4π steradians.
Five years late, but to my knowledge the kg is used as the standard unit as it fits better with the other units (at least in physics). For example, we measure a Newton as 1 kg*m/s^2. If the gram was used instead, we would be dealing with everyday forces in thousands... If we used grams, the force of gravity acting on a 1 kilogram object would be 9,800 N. A 70 kilogram person would be measured as 70,000 grams. It makes calculations far easier and you end up with measurements on a smaller scale that are easier to comprehend. I believe it was called the kg and not the g due to chemistry and the smaller masses involved.
Kilogram is scheduled for not being a basic unit anymore. It will be a derived unit from Plank's constant and the Second (thud the speed of light and the meter).
You will be taking weight and time measurements with a tricorder soon.
Never heard of sievert and katal (or most of the outer prefixes except iota and got zeta)
Spend way too much time typing becquerel.. I knew it had the u, tried different amounts of r and l, maybe even tried the c, but not cq.
Actually sievert is starting to come back..there was this cartoon called seabert about a seal stopping bad guys... I think there is a link in my memory there
The imperial system is still widely used in the United Kingdom, as well as in the US, Belize and Burma. It was also widely used throughout the Commonwealth until a few decades ago. So not really ancient.
Imperial system hasn't been taught at schools since the 70's; it's only the old folks that use metric all the time. Our roadsigns are in miles and there are a few other holdovers (we drink beer in pints but going metric would mean less beer!) but kg, metres and litres are the prefered for most young people.
I got everything except zepto and yocto, but i think thats a reflection of me being a massive nerd who does nothing but look at physics articles and read textbooks
so uh back in the nineteen-eighties i actually worked with stanford moore. you might hhave heard of him? Nobel prize laureate? He was huge. ANyway i wasnt even talking about him
I actually also worked in fred sanger's lab( you probably know him as laureate FREDERICK SANGER ) and hes not even from the united states.
Anyway, before any of this, i was in school. and i remember using H for enthalpy, not Henry. what does a a henry even measure??????
Funfact: English king Henry II (read: Henry the second) is the only (well-known) person in history, whose name consists of two SI-units (although Becquerel's first name was Henri, but it is spelled differently).
Funfact : all the units here accept the prefixes except... kilogram.
The former base units was gram, then kilogram was though to be more useful as a base units so they took it instead of gram but you still need to use gram as the "radical" for units using prefixes like milligram mg (and not a micro kilogram, µkg).
To be sure you are still confused, there are also multiples of the kilogram like quintal (100 kg) or tonne / metric ton (1000 kg) a.k.a 1 Mg :)
Basically, take a sphere, draw a circle on it. Now, join the circumference to the centre of the sphere. That angle formed will be measured in steradians...
Just like and entire circle is 2π radians, and sphere is 4π steradians.
Otherwise they should have called the kg the gram, the gram the milligram, etc
You will be taking weight and time measurements with a tricorder soon.
1 µm is "one micrometer" and it is "a millionth of a meter"
Tell me if i am wrong(i am not the smartest here;)
(for non-german-speakers: Herz is the german word for heart)
Spend way too much time typing becquerel.. I knew it had the u, tried different amounts of r and l, maybe even tried the c, but not cq.
Actually sievert is starting to come back..there was this cartoon called seabert about a seal stopping bad guys... I think there is a link in my memory there
But if you want to burn a few hundred million dollars every few years due to unnecessary conversion errors - you do you.
I actually also worked in fred sanger's lab( you probably know him as laureate FREDERICK SANGER ) and hes not even from the united states.
Anyway, before any of this, i was in school. and i remember using H for enthalpy, not Henry. what does a a henry even measure??????
The former base units was gram, then kilogram was though to be more useful as a base units so they took it instead of gram but you still need to use gram as the "radical" for units using prefixes like milligram mg (and not a micro kilogram, µkg).
To be sure you are still confused, there are also multiples of the kilogram like quintal (100 kg) or tonne / metric ton (1000 kg) a.k.a 1 Mg :)