![]() ![]() The meaning of k P and MPa is very important because you'll need to understand the concept of stress and strenght. The following relationship must be learned by heart: 1 Pa ![]() If someone borrows 10 dollars from you, you would insist of the same unit, wouldn't you? This simple example points out that the unit is of great important. If someone borrowed 10 dollars from you and the borrower settles his debt with 10 cents you wouldn't be happy about it, although the number is identical. The following will emphasize the importance of the units: Try to learn them by heart as they will be referred to in different units of competency. Students need to familiarise themselves with quantities, symbols and units. (Many symbols are unfortunately Greek letters) You should try to memorise the symbols and units listedīelow. Symbols and base units used in Competency Units Or alternatively, for use with liquids and gases: VOLUME SI unit: cubic metre (m³) 1000 cubic centimetres (cm³) Tables of measures for mass, length, area and volume are set out belowĪREA SI unit: square metre (m²) 100 square millimetres (mm²) ![]() Centimetre is a recognised unit of length but centigram is not a recognised unit of mass. * The prefixes `centi' and `deci' are only used with the metre. The Common Prefixes and Units Prefix & Symbol For instance, since the prefix kilo (k) stands for 1000, 1 kilometre (km) equals 1000 metres (m), and any change from metres to kilometres or vice versa simply involves a decimal point or zeros as shown below. This results from the practical system of attaching to unit names (symbols) standard prefixes that stand for some of the powers of 10 such as 0.001 (milli), 1000 (kilo). One of the main reasons for this is the simple compatibility of the metric system with our world-wide numerals and arithmetic based on the 10 digits and their position relative to a decimal point. The metric system, and especially that part of it called the SI (le Systéme International d'Unités or, in plain English, the International System of Units), is by far the simplest and most rational system of units devised. So in this instance the volumetric weight is lower than the physical weight meaning that the price would be calculated on 10kg.Units and formulas Metric system, symbols & units You could have a small box of heavy metal components (30 cm x 30 cm x 20cm) weighing 10kg in physical weight. It's worth noting that it works the other way around too. Any bulges, handles, tags or packaging that could break the beam of a measuring laser must be included. For this reason it is extremely important to measure parcel(s) their widest, longest and highest points. As the volume 'outweighs' the physical weight of 5kgs, the price is based on 50 kilograms. Using the above calculation (length X width X height / 5000), the volume of this parcel is 50 volumetric kilograms. ![]() This is because our pricing is calculated based on whichever is the greater out of the volumetric weight and the physical weight.įor example, you could have a box of feathers that is quite large, say 100 cm X 50 cm X 50 cm but is relatively lightweight at 5kgs. You may often find that the price of your shipment is dictated by the volumetric weight of your parcel(s) rather than the physical weight. Volumetric weight can be calculated by multiplying the length, width and height of a parcel (in cm) and dividing that figure by 5000 (some carriers use a divisor of 4000). Volumetric weight refers to the overall size of a parcel and is measured in volumetric kilograms. ![]()
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