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How do binoculars work?

22 May, 2020
Binoculars belonging to a Congressional Medal of Honor winner © Minnesota Historical Society (Flickr) What are Binoculars? Binoculars are, in essence, two telescopes mounted side by side in a hand-held device. However, unlike telescopes, binoculars are designed to be views…

How many hours are in a year?

22 May, 2020
Number of hours in a day, and number of days in a year Hours in a day Most people know that there are 24 hours in a day. This is the simple bit of the calculation. Days in a year…

How many miles are in 5k?

22 May, 2020
© .shock young man ready for run on the start position ready to run © .shock Why should you want to know? There are all sorts of reasons for wanting to convert miles to kilometres, but here are the commonest…

How much does one gallon of water weigh?

22 May, 2020
History of a gallon A gallon is a measure of volume, equating to either 3.79L or 4.55L depending on its usage. The imperial (UK) gallon is equal to 4.546 L. It was made obsolete through The Units of Measurement Regulations…

How many centimetres are in a metre?

22 May, 2020
© Sergey yellow ruler isolated on white © Sergey Introducing the metric system Before metric measurements were introduced, the length of something was measured using the imperial system which included feet, inches, miles, furlongs and others. The lack of common…

How many feet are in a metre?

22 May, 2020
© aussiegall (Flickr) Measuring time © aussiegall (Flickr) Origins of the Imperial system The units in use in the imperial system were historically derived from units used by the Roman Legion, and were in use in England at the time…

How many miles are in a kilometre?

22 May, 2020
© Semhur (commons.wikimedia.org) A Kilometre and Mile Unit Comparison Scale © Semhur (commons.wikimedia.org) Basics of kilometres and miles The kilometre (symbolised as km) is a distance unit in the metric system mostly used to express geographical distances. It is equal…

Converting imperial measurements to metric

22 May, 2020
© Joe Shlabotnik (Flickr) Calculators © Joe Shlabotnik (Flickr) Useful conversion factorsThe UK still uses miles not kilometres, many people still think in degrees fahrenheit rather than centigrade, and weights are still sometimes given in pounds rather than kilograms.There are…