Write Measurement Units Clearly in Blog Posts

Write the quantity, value and unit so their relationship is clear, then check the notation without changing the supplied measurement. A wording repair should not quietly turn into a new value or an unsupported interpretation of what was measured.

These four repairs address SI unit symbols and dimensions in prose. They use original fictional craft-blog inputs, not measurements taken from a real project. NIST's SI writing guidance supports the symbol and spacing conventions; its SP 811 quantity-value guidance explains how to keep values associated with their units.

Keep unit symbols unchanged for plural quantities

Change 12 cms to 12 cm, and 2 kgs to 2 kg. The invented length stays twelve centimetres and the invented mass stays two kilograms; the repair removes the extra plural letter from each symbol.

A unit symbol is not a shortened ordinary word that takes an added s. NIST distinguishes symbols from spelled-out unit names. Choose the form you intend to use and write it consistently; do not create a hybrid such as kgs.

Leave a space before the temperature unit

Change 18°C to 18 °C. This imaginary input describes ambient temperature in degrees Celsius. The space belongs between the number and the complete °C symbol; the degree sign and the C stay together.

NIST's spacing rule has a plane-angle exception for °, ′ and ″. That exception is about angle symbols, so it does not remove the space before a Celsius temperature unit. The presence of a degree sign alone is not enough to choose the exception.

Identify the unit for each dimension

The fictional source record supplies a shelf width of 25 cm and a height of 15 cm. Replace 25 x 15 cm with 25 cm × 15 cm, and identify the order as width × height. A complete sentence is:

The imaginary shelf is 25 cm wide and 15 cm high.

The unit now accompanies each value, and the sentence tells the reader which dimension each value describes. NIST's quantity-value guidance recommends making the association between a value and its unit unambiguous.

Do not infer the dimensions or units when the underlying record does not supply them. In this case both centimetres and the width/height order are specified teaching inputs. For a real example with missing information, check the source before rewriting it.

Preserve the supplied quantity while repairing its wording

Use a before-and-after record so you can see exactly what changed:

Every number is retained. These are notation repairs, not unit conversions, precision adjustments or evidence that a physical quantity was measured correctly.

Download the filled measurement style card (Markdown). It records the original wording, supplied quantity, value, unit, repair and supporting notation source. Use the completed examples as a model, then fill the reusable row from your own source. If a field is unknown, keep it unknown until you check it.

SP 811 is an older notation reference; it is used here for writing conventions, not as the source of current SI unit definitions. These examples concern the stated SI quantities, not a universal style rule for every kind of number in a blog.

Connect the quantities to a useful reader task in your blogger's keyword plan, explain them in the article body, and preserve the supplied values and sources in the article brief.