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 {{traveltopic}}   {{traveltopic}} 
   
−  Most countries in the world now use the metric system. Almost the only holdout is the [[USA]] and to some extent, the [[United Kingdom]] which, oddly enough, still use the old British Imperial system of weights and measures. The only units the two systems have in common are time units from second to century.  +  Most countries in the world now use the metric system. Almost the only holdouts still using the old British Imperial system of weights and measures are the [[USA]] and [[Liberia]] (and [[Burma]] which uses yet another system). The [[United Kingdom]] and [[Canada]] (except the already fully metrified francophone [[Quebec]]) are in a curious state halfway between metric and Imperial units, and while many things are measured in metric, you will still often encounter miles, pints, feet and stone during your visit. The only units the two systems have in common are time units from second to century. 
   
 We use "=" signs below, but all are approximate.   We use "=" signs below, but all are approximate. 
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−  colspan="3" style="borderright:solid blue 1px; borderleft:dotted gray 2px"←freezing  +  colspan="4" style="borderright:dotted blue 2px"←freezing 
−  colspan="2" style="borderright:solid lightblue 2px"cold  +  colspan="2" style="borderright:solid blue 2px"cold 
−  colspan="2" style="borderright:solid lightgreen 2px"cool  +  colspan="2" style="borderright:solid lightblue 2px"cool 
 +  colspan="2" style="borderright:solid lightgreen 2px"mild 
 colspan="2" style="borderright:solid yellow 3px"warm   colspan="2" style="borderright:solid yellow 3px"warm 
 colspan="2" style="borderright:solid orange 2px"hot   colspan="2" style="borderright:solid orange 2px"hot 
−  colspan="2" style="borderright:solid red 3px"swelter  +  colspan="2" style="borderright:solid red 2px"swelter 
−  colspan="2" style="borderright:dotted black 1px"cooked  +  colspan="2" cooked→ 
     
−  ! °C  +  ! style="borderright:dotted gray 1px"°C 
−   0  '''4'''  7  '''10'''  13  '''15'''  18  '''21'''  24  '''26'''  30  '''32'''  35  40  +   40 '''18'''  4  0  '''4'''  7  '''10'''  13  '''15'''  18  '''21'''  24  '''26'''  30  '''32'''  35  '''40''' 
  style="fontstyle:italic; lineheight:50%"    style="fontstyle:italic; lineheight:50%" 
−  ! °F  +  ! style="borderright:dotted gray 1px"°F 
−   32  '''40'''  45  '''50'''  55  '''60'''  65  '''70'''  75  '''80'''  85  '''90'''  95  104  +   40  '''0'''  25  32  '''40'''  45  '''50'''  55  '''60'''  65  '''70'''  75  '''80'''  85  '''90'''  95  '''104''' 
 }   } 
   
 {{infobox    {{infobox  
−  :'''100 °C''' — '''''212 °F''''' — water boils  +  :'''100 °C''' — '''''212 °F''''' — Water boils 
−  :'''37 °C''' — '''''98.6 °F''''' — human body temperature  +  :'''58 °C''' — '''''136 °F''''' — Highest temperature recorded on Earth 
−  :'''0 °C''' — '''''32 °F''''' — water freezes  +  :'''37 °C''' — '''''98.6 °F''''' — Human body temperature 
−  :'''18 °C''' — '''''0 °F''''' — ouch  +  :'''20 °C''' — '''''68 °F''''' — Room temperature 
−  :'''40 °C''' — '''''40 °F''''' — ''forty below zero!''  +  :'''0 °C''' — '''''32 °F''''' — Water freezes 
 +  :'''18 °C''' — '''''0 °F''''' — Ouch. Finnish people start to wear jackets. 
 +  :'''40 °C''' — '''''40 °F''''' — ''Forty below zero!'' 
 +  :'''89 °C''' — '''''129 °F''''' — Lowest temperature recorded on earth 
 +  :'''273.15 °C''' — '''''459.67 °F''''' — Absolute zero 
 }}   }} 
   
−  '''Humidity.''' Hot weather, say 80°F (26°C) and up, is more uncomfortable in '''humid''' air than in dry air because dry air allows more sweat to evaporate from your skin and this cools you but humid air inhibits this evaporation and leaves you more susceptible to overheating.
 
   
−  '''Drink lots of water''' in hot weather to replenish the water your body sweats as it attempts to cool itself.
 +  For those who are not used to Metric thermometers, there are a few ways to think about it... 
   
−  '''A temperature drop''' will catch you by surprise one day without a jacket. Pack sufficient clothes to bundle up.
 +  '''Option 1''': From Metric (Celsius) to Fahrenheit, double the number and add 30. From Fahrenheit to Celsius, subtract 30 and divide in half. This is not exact and it won't work for much higher or lower temperatures, but it will be close enough to understand what the temperature is. 
−   +  
−  For those of us who are not used to Metric thermometers, there are a few ways to think about it...
 +  
−   +  
−  '''Option 1''': From Metric (Celsius) to Fahrenheit, double the number and add 30. From Fahrenheit to Celsius, subtract 30 and divide in half. This is not exact and it won't work for much higher or lower temps, but it will be close enough to understand what the temperature is.  +  
   
 '''Option 2''': A nice little poem to remember for Celsius...   '''Option 2''': A nice little poem to remember for Celsius... 
−  Zero is freezing  +  Zero is freezing. 
−  10 is not  +  10 is not. 
−  20 is warm  +  20 is warm. 
−  and 30 is hot  +  and 30 is hot! 
   
−  '''Option 3''': For the mathematically inclined: Fahrenheit=(C*1.8)+32. Celsius=(F32)/1.8  +  '''Option 3''': For the mathematically inclined or those with a calculator: Fahrenheit=(C*1.8)+32. Celsius=(F32)/1.8 
   
 ==Length and distance==   ==Length and distance== 
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 === Comparisons ===   === Comparisons === 
−  * A credit card is about 0.75 mm (3/4 of a millimetre) thick.  +  * A credit card is about 0.75 mm (3/4 of a millimetre) thick 
 * 1 cm (centimetre) is the width of an average fingernail.   * 1 cm (centimetre) is the width of an average fingernail. 
 * Most adults are between 1.5 and 2 metres tall.   * Most adults are between 1.5 and 2 metres tall. 
−  * 1 Km (Kilometre) takes about 15 minutes to walk.  +  * 1 km (Kilometre) takes about 15 minutes to walk. 
   
 ==Weight==   ==Weight== 
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 ==Surface area==   ==Surface area== 
−  For small things, one might use square inches or square centimeters. There are about 6.5 cm<sup>2</sup> to one in<sup>2</sup>.  +  For small things, one might use square inches or square centimeters. There are about 6.5 cm<sup>2</sup> in one in<sup>2</sup>. 
   
−  For floor area of an apartment, there are about 11 square feet to the square meter.  +  For floor area of an apartment, there are about 11 square feet in one square meter. 
   
−  For large areas, there are about 2.5 acres to the hectare.  +  For large areas, there are about 2.5 acres in one hectare. 
   
 == Volume ==   == Volume == 
   
 The standard metric unit of volume is the litre.   The standard metric unit of volume is the litre. 
 +  
 Many things, however, are measured in ml (millilitres) or equivalently in cc (cubic centimetres). Roughly, a teaspoon is 5 cc and a fluid ounce is 30 cc.   Many things, however, are measured in ml (millilitres) or equivalently in cc (cubic centimetres). Roughly, a teaspoon is 5 cc and a fluid ounce is 30 cc. 
   
−  In both the US and Imperial systems, 4 quarts = 1 gallon and 2 pints = 1 quart. However, the US units are smaller than Imperial counterparts. A US quart is 32 fuid ounces while Imperial is 40; a liter is in between at 35. A US gallon is 128 ounces or 3.78 litres, while an Imperial gallon is 160 ounces or 4.54 litres.  +  In both the US and Imperial systems, 4 quarts = 1 gallon and 2 pints = 1 quart. However, the US units are smaller than Imperial counterparts. A US quart is 32 fluid ounces while Imperial is 40; a litre is in between at 35. A US gallon is 128 ounces or 3.78 litres, while an Imperial gallon is 160 ounces or 4.54 litres. 
   
 For car and motorcycle engines, displacement might be given in cc or litres or cubic inches. 1000 cc or one litre is 61 cubic inches.   For car and motorcycle engines, displacement might be given in cc or litres or cubic inches. 1000 cc or one litre is 61 cubic inches. 
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 === Comparisons ===   === Comparisons === 
   
−  * 1 litre of water weighs 1 Kg. Since many liquids (milk, orange juice) are sold in litre containers it is easy to judge 1 litre or 1 Kg.  +  * 1 L of water weighs 1 kg. Since many liquids (milk, orange juice) are sold in litre containers it is easy to judge 1 L or 1 kg. 
   
−  * 1 litre is equivalent to a cube 10 cm x 10 cm x 10 cm.  +  * 1 L is equivalent to a cube 10 cm x 10 cm x 10 cm. 
   
−  * 1 Cubic Metre (1 m<sup>3</sup>) = 1000 litres. 1 m<sup>3</sup> of water weighs 1000 Kg = 1 Tonne. Do not try to pick this up yourself!  +  * 1 Cubic m (1 m<sup>3</sup>) = 1000 litres. 1 m<sup>3</sup> of water weighs 1000 kg = 1 Tonne. Do not try to pick this up yourself! 
   
−  * In Europe, wine is usually sold in 700 ml (0.7 litre) bottles (occasionally 750 ml or 1 litre).  +  * In Europe, wine is usually sold in 750 mL (0.75 L) bottles (occasionally 700 mL or 1 L). 
   
 == Metric prefixes ==   == Metric prefixes == 
   
−  1 mm = 1 / 1000 metres, 1 mg = 1 / 1000 g, 1 ml = 1 / 1000 litres.  +  1 mm = 1 / 1000 metres, 1 mg = 1 / 1000 g, 1 mL = 1 / 1000 Litres. 
   
 1 cm = 1 / 100 metres.   1 cm = 1 / 100 metres. 
   
−  1 Km = 1000 metres, 1 Kg = 1000 grammes.  +  1 km = 1000 metres, 1 kg = 1000 grams. 
 +  
 +  {{usabletopic}} 
 +  
 +  [[fi:Mittausjärjestelmät]] 