Metric load / Mass

Most world are acquainted with words “weight”, some may also know the term “mass”. For most things in daily usage, they mean pretty lot the same. You can come across the ax “mass” in referral to body mass or your BMI (body fixed index). The is simply a case of measure up how hefty something is.

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If you need to pick miscellaneous up, that is an excellent to understand how hefty it is, and in the metric device it would certainly be measure up in kilograms. Keep in mind that the price kg is offered both for 1 kilogram or several kilograms, e.g. 75 kg way 75 kilograms.

The kilogram is also divided right into 1000 parts referred to as grams. The is simple to remember together kilo in ~ the start of a word means thousand, for this reason 1 kilogram = 1000 grams.

The symbol for grams is g, so 1000 g = 1 kg.

Name the unitSymbolEquivalentTypical article measured in this unit
microgramµg0.000 001 gmedicine
milligrammg1000 µgmedicine
gramg1000 milligramssmall amounts of food or jewellery
kilogramkg1000 gbody mass, load of family members furniture and large objects, bag that rice
tonnet1000 kgweights of cars, boats, ships
megagramMg1 tonnerarely used, tonne is preferred
megatonneMt1 million tonnesmegatonne is no actually used, although about theory it might be supplied as a unit that mass.However the hatchet megaton is used as a unit the energy, tantamount to the quantity of power in an explosion resulted in by 1 million tonnes of TNT.

Your weight, additionally known together body mass, have the right to be measure up in kilograms. If you have a set of scales to sweet yourself, girlfriend will probably see kilograms or kg marked on the scale. If you have digital scales, they deserve to usually be set to one of two people kg or stone-age units. Collection it come kg, obtain on the scales and measure your body mass. Average weights for men are approximately 66 kg (based on height of 173 cm), and also for women roughly 60 kg (based on elevation of 165 cm). These numbers are also based top top a BMI that 22. Back the weight of babies vary, the mean birth load of 3.4 kg remains fairly constant.

BMI (Body massive Index)

To calculate your BMI, usage the complying with formula: mass split by elevation squared. Mass measured in kilograms, and also height in metres, so the for a typical man we have 66 kg / (1.73m×1.73m) = 22.0 (remember the 1 metre = 100 cm, see size page for much more info). This is a healthy BMI, as is any figure in between 20 and 25. Listed below 20 means you room underweight, e.g. 60 / (1.75×1.75) = 19.5 i beg your pardon is contempt underweight.

A much more extreme instance might be such as a man weighing 55 kg yet he is 1.80 metres tall, which way his BMI = 55 / (1.8×1.8) = 17.0 — if your BMI is that low friend should try to put on part weight.


For various other purposes, we can use kilograms in our everyday lives, together as when shopping, and also buying food, one of two people pre-packed with a printed weight, such together 1 kg, 2.25 kg, etc. Or loosened fruit and vegetables, which might be priced as 74 pence every kg, or £1.20 / kg. For loose goods the price you pay will depend on the weight of the goods, and at the checkout this items will certainly be weighed, and the electronic scales should display screen a weight, e.g. 0.67 kg, and calculate the price, at the very least that’s how it works in modern-day supermarkets. For this reason if it to be £1 per kilogram and you buy 670 grams of something, the price would be £1 × 0.67 kg = 67 pence. If it was 50 pence every kilogram and you to buy 1 kg, the price would be £0.50 × 1 kg = 50 pence.

If you space buying water, the bottles space always marked in litres (see volume page). 1 litre of water weighs 1 kg, so if you are going to buy many water, make certain you can carry as plenty of kilograms together there space litres, e.g. If you can lug 5 kg, climate you can buy 5 litres. Many other liquids/drinks space heavier than water, for this reason remember that 1 litre of other drinks will certainly be contempt heavier 보다 1 kg.

To measure bigger than kilograms, we use tonnes. 1 tonne = 1000 kg.

To measure weights smaller than 1 gram, we have the right to use milligrams (mg) and micrograms (µg). 1000 mg = 1 g, 1000 µg = 1 mg, 1 000 000 µg = 1 g. This are offered in science and also medicine, and you may uncover that pills and tablets because that vitamins or medicines have values of materials in mg or µg. Periodically though µg will be written as mcg, as the prefix µ is a Greek letter and not easy to type on some systems.

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How are the systems of weight defined?

Weight is a variable of length. As soon as we begin with the size of one metre, which was carefully identified (see web page on length) we deserve to divide that right into 100 equal parts, dubbed centimetres. We can then calculation volume in cubic centimetres. If we then take it 1 cubic centimetre of water, at room temperature (20°C), us can define this as having actually a massive of 1 gram. Us can additionally say the 1000 cm3 that water deserve to be characterized as 1 litre in volume, and also that very same volume at room temperature that 20°C has actually a massive of 1 kilogram. So you have the right to see, this is how we obtain the kilogram, and you have the right to see that weight (mass), volume and also length are all inter-related, which renders calculations in metric really easy. 1 litre the water weighs 1 kg.