Emission intensity is the volume of emissions per unit of GDP. Reducing emission intensity means that less pollution is being created per unit of GDP. BUT! And this is a big ‘but’ – if GDP grows then so too do total emissions. A more concrete measure of emission reduction is an “absolute reduction”. That‘s the reduction in the total emissions. To tackle climate change total emissions must go down so an absolute reduction is the most relevant measure. Developed countries, like the US and Europe, have submitted absolute emission reduction targets reflecting their intent to reduce their total emissions. Show Australia’s capacity to reduce emissions is very high. For example, our emission intensity is roughly twice that of the USA (twice as many tonnes of CO2-e* per $million GDP) and about 2.5 times that of Europe. So really, we have the capacity to reduce our emissions more than either the USA or Europe. However, because we start from such a high emission intensity we have a lot of “low-hanging fruit” and even relatively easy reductions in emission intensity will look large in terms of percentage. *The ‘e’ in CO2-e stands for ‘equivalent’. This gives other greenhouse gases such as methane, nitrous oxide, etc. a value in CO2 based on their global warming potential. That way you can total them all, rather than having a list of different gases. While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions. Select Citation Style Copy CitationShare Share Share to social media Facebook Twitter URL https://www.britannica.com/science/International-System-of-UnitsGive Feedback External Websites Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Your Feedback Submit FeedbackThank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article. External Websites
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Alternate titles: SI, SI System, Système International d’Unités By The Editors of Encyclopaedia Britannica Article History Table of ContentsRelated Topics:mole kilogram second metre kelvin...(Show more) See all related content → Summary Read a brief summary of this topic Understand the International System of Units and its seven basic SI Units See all videos for this articleInternational System of Units (SI), French Système International d’Unités, international decimal system of weights and measures derived from and extending the metric system of units. Adopted by the 11th General Conference on Weights and Measures (CGPM) in 1960, it is abbreviated SI in all languages. Rapid advances in science and technology in the 19th and 20th centuries fostered the development of several overlapping systems of units of measurements as scientists improvised to meet the practical needs of their disciplines. The early international system devised to rectify this situation was called the metre-kilogram-second (MKS) system. The CGPM added three new units (among others) in 1948: a unit of force (the newton), defined as that force which gives to a mass of one kilogram an acceleration of one metre per second per second; a unit of energy (the joule), defined as the work done when the point of application of a newton is displaced one metre in the direction of the force; and a unit of power (the watt), which is the power that in one second gives rise to energy of one joule. All three units are named for eminent scientists. Britannica Quiz Fun Facts of Measurement & MathUnderstand the concept of derived units of measurement See all videos for this articleThe 1960 International System builds on the MKS system. Its seven basic units, from which other units are derived, were defined as follows: for length, the metre, defined as the distance traveled by light in a vacuum in 1/299,792,458 second; for mass, the kilogram, which equaled 1,000 grams as defined by the international prototype kilogram of platinum-iridium in the keeping of the International Bureau of Weights and Measures in Sèvres, France; for time, the second, the duration of 9,192,631,770 periods of radiation associated with a specified transition of the cesium-133 atom; for electric current, the ampere, which was the current that, if maintained in two wires placed one metre apart in a vacuum, would produce a force of 2 × 10−7 newton per metre of length; for luminous intensity, the candela, defined as the intensity in a given direction of a source emitting radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian; for amount of substance, the mole, defined as containing as many elementary entities of a substance as there are atoms in 0.012 kg of carbon-12; and for thermodynamic temperature, the kelvin. On May 20, 2019, the CGPM redefined the kilogram, the ampere, the mole, and the kelvin in terms of fundamental physical constants. For the kilogram, the constant chosen was Planck’s constant, which is defined as equal to 6.62607015 × 10−34 joule second. One joule is equal to one kilogram times metre squared per second squared. Since the second and the metre were already defined, the kilogram would then be determined by accurate measurements of Planck’s constant. The ampere was redefined such that the elementary charge is equal to 1.602176634 × 10−19 coulomb. The kelvin was redefined such that the Boltzmann constant is equal to 1.380649 × 10−23 joule per kelvin, and the mole was redefined such that the Avogadro constant is equal to 6.02214076 × 1023 per mole. Widely used units in the SI systemA list of the widely used units in the SI system is provided in the table. International System of Units (SI)unitabbreviationphysical quantityBase unitsmetremlengthsecondstimekilogramkgmassampereAelectric currentkelvinKthermodynamic temperaturecandelacdluminous intensitymolemolamount of substanceunitabbreviationnumber of metresapproximate U.S. equivalentLengthkilometrekm1,0000.62 milecentimetrecm0.010.39 inchmillimetremm0.0010.039 inchmicrometreμm0.0000010.000039 inchnanometrenm0.0000000010.000000039 inchunitabbreviationnumber of square metresapproximate U.S. equivalentAreasquare kilometresq km, or km21,000,0000.3861 square milehectareha10,0002.47 acresarea100119.60 square yardssquare centimetresq cm, or cm20.00010.155 square inchunitabbreviationnumber of cubic metresapproximate U.S. equivalentVolumecubic metrem311.307 cubic yardscubic centimetrecu cm, cm3, or cc0.0000010.061 cubic inchunitabbreviationnumber of litresapproximate U.S. equivalentCapacitykilolitrekl1,0001.31 cubic yardslitrel161.02 cubic inchescentilitrecl0.010.61 cubic inchmillilitreml0.0010.061 cubic inchmicrolitreμl0.0000010.000061 cubic inchunitabbreviationnumber of gramsapproximate U.S. equivalentMass and weightmetric tont1,000,0001.102 short tonsgramg10.035 ouncecentigramcg0.010.154 grainmilligrammg0.0010.015 grainmicrogramμg0.0000010.000015 grainunitsymbolphysical quantityexpressed in base unitsEnergyhertzHzfrequency1/snewtonNforce, weight(m × kg)/s2jouleJwork, energy, quantity of heat(m2 × kg)/s2pascalPapressure, stresskg/(m × s2)wattWpower(m2 × kg)/s3coulombCelectric charges × AvoltVelectric potential difference(m2 × kg)/(s3 × A)faradFelectric capacitance(s2 × s2 × A2)/(m2 × kg)ohmΩelectric resistance, reactance(m2 × kg)/(s3 × A2)siemensSelectric conductance(s3 × A2)/(m2 × kg)weberWbmagnetic flux(m2 × kg)/(s2 × A)teslaTmagnetic inductionkg/(s2 × A)henryHinductance(m2 × kg)/(s2 × A2)lumenlmluminous fluxcd × srluxlxilluminance(cd × sr)/m2 Metric conversionsA list of metric conversions is provided in the table. Get a Britannica Premium subscription and gain access to exclusive content. Subscribe Now Common equivalents and conversion factors for U.S. Customary and SI systemsapproximate common equivalents*Common term not used in SI.**Exact.Source: National Bureau of Standards Wall Chart.1 inch= 25 millimetres1 foot= 0.3 metre1 yard= 0.9 metre1 mile= 1.6 kilometres1 square inch= 6.5 square centimetres1 square foot= 0.09 square metre1 square yard= 0.8 square metre1 acre= 0.4 hectare*1 cubic inch= 16 cubic centimetres1 cubic foot= 0.03 cubic metre1 cubic yard= 0.8 cubic metre1 quart (liq)= 1 litre*1 gallon= 0.004 cubic metre1 ounce (avdp)= 28 grams1 pound (avdp)= 0.45 kilogram1 horsepower= 0.75 kilowatt1 millimetre= 0.04 inch1 metre= 3.3 feet1 metre= 1.1 yards1 kilometre= 0.6 mile (statute)1 square centimetre= 0.16 square inch1 square metre= 11 square feet1 square metre= 1.2 square yards1 hectare*= 2.5 acres1 cubic centimetre= 0.06 cubic inch1 cubic metre= 35 cubic feet1 cubic metre= 1.3 cubic yards1 litre*= 1 quart (liq)1 cubic metre= 264 gallons1 gram= 0.035 ounce (avdp)1 kilogram= 2.2 pounds (avdp)1 kilowatt= 1.3 horsepowerconversions accurate within 10 parts per millioninches × 25.4**= millimetresfeet × 0.3048**= metresyards × 0.9144**= metresmiles × 1.60934= kilometressquare inches × 6.4516**= square centimetressquare feet × 0.0929030= square metressquare yards × 0.836127= square metresacres × 0.404686= hectarescubic inches × 16.3871= cubic centimetrescubic feet × 0.0283168= cubic metrescubic yards × 0.764555= cubic metresquarts (liq) × 0.946353= litresgallons × 0.00378541= cubic metresounces (avdp) × 28.3495= gramspounds (avdp) × 0.453592= kilogramshorsepower × 0.745700= kilowattsmillimetres × 0.0393701= inchesmetres × 3.28084= feetmetres × 1.09361= yardskilometres × 0.621371= miles (statute)square centimetres × 0.155000= square inchessquare metres × 10.7639= square feetsquare metres × 1.19599= square yardshectares × 2.47105= acrescubic centimetres × 0.0610237= cubic inchescubic metres × 35.3147= cubic feetcubic metres × 1.30795= cubic yardslitres × 1.05669= quarts (liq)cubic metres × 264.172= gallonsgrams × 0.0352740= ounces (avdp)kilograms × 2.20462= pounds (avdp)kilowatts × 1.34102= horsepower Ist IU und IE das gleiche?Die Abkürzung I.E. (oder englisch I.U.: U = unit = Einheit) bedeutet “Internationale Einheit”, womit ausgedrückt werden soll, dass Einheit in allen Ländern gleich definiert ist. Der Begriff I.E. darf nicht als Mengenangabe verstanden werden.
Wie viel ist 1 IE?1 IE Insulin ≙ 41,67 µg Insulin (hochrein) ≙ 35 µg Insulin (wasserfrei) 1 IE Vitamin A ≙ 0,3 µg Retinol ≙ 0,6 µg Beta-Carotin.
Warum internationale Einheiten?Die Internationale Einheit (Abkürzung IE oder I. E.; englisch international unit, IU oder U) ist eine Maßeinheit für die Wirkung (und nicht für z. B. die Stoffmenge oder die Masse) einer medizinisch verwendeten Substanz. Sie dient der Quantifizierung der Wirkung eines Stoffes oder eines medizinischen Präparates.
Was bedeutet 1.000 IE?Säuglingsmilchnahrung. Vitamin D wird in Mikrogramm (µg) oder in internationalen Einheiten (IE) angegeben. 1 µg entspricht 40 IE bzw. 1 IE entspricht 0,025 µg.
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Was ist der unterschied zwischen internationale units und units
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