Space Between Number And Unit
5 0 cm not 5 0cm or 5 0 c m 45 kg not 45kg or 45 k g.
Space between number and unit. However it does not specify the width of the space. Never insert the word of between the unit and number and avoid splitting the unit and number within a sentence they should always go together. Newton x meter should be written as n m.
This first point may seem self evident. 5 0 cm not 5 0cm or 5 0 c m 45 kg not 45kg or 45 k g 32 c not 32 c or 32 c 20 kn m not 20 knm or 20 k nm. A space is always used to separate the unit from the number.
However if a hyphen is used write out the name of the metric quantity with the hyphen between the numeral and the quantity. The international system of units si prescribes inserting a space between a number and a unit of measurement being regarded as a multiplication sign but never between a prefix and a base unit. As for readability i am not aware of any studies on this so i can only give you my informed opinion.
The international system of units si recommends inserting a space between a number and a unit of measurement units and between units in compound units but never between a prefix and a base unit. 7 m 31 4 kg 37 c. For example if you want to say you threw a ball 100 feet there is a space between the number 100 and the whole word feet.
A 25 kg sphere an angle of 2 3 4 if the spelled out name of a unit is used the normal rules of english apply. You put a space between the number and the unit of measure. Always put a space between the number and unit e g 203 65 m 457 um ph.
A dash is needed to be used to separate units that are multiplied together in s i units. A four digit number doesn t need to maintain the grouping of three separated by spacing unless the four digit number is used in a column of numbers with five or more digits. When a metric value is used as a one thought modifier before a noun hyphenating the quantity is not necessary.