How do you say "80 square meters" in English? |mass flowmeter

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1. What are the errors in expressing measurement units in papers? Common errors in expressing measurement units in papers include incorrect numerical expressions, lack of spaces between numbers and units, illogical unit expressions, unnecessary expansion or abbreviation of unit names, and inconsistent units in subject verb language. Specifically, different journals have different requirements for numerical expression, and some suggest spelling numbers below 10 (without units), such as "nine subjects". Numbers must be spelled at the beginning of sentences or titles, or their positions can be changed by rephrasing them. For example, 14 locations were selected for stress measurement is incorrectly expressed as 14 locations were chosen for the stress measurements, but correctly as Fourteen locations were chosen for the stress measurements or We chose 14 locations for the stress measurements. Numbers and units are usually separated by a space, such as "First, 10 mL of the sample was added to the reaction mixture. A 10% change in temperature was observed". The error is "First, 10 mL of the sample was added to the reaction mixture. A 10% change in temperature was observed". Exception: The unit of equivalent concentration (N) must be immediately next to the number; Degrees Celsius (° C): Some journals require spaces between numbers, while others require adjacent spaces. Please confirm the requirements of the target journal; The percent sign (%), degree sign (°), and prime sign (") are not units and should be placed next to numbers, such as" 20% increase, an angle of 5 °, and 5 - end ". Unreasonable units indicate that the use of units should be logical, such as "The size of the board used is 9 × 6 mm2", incorrectly expressed as "The area of the sheet used was 9 × 6 mm2", and correctly expressed as "The dimensions of the sheet used were 9 × 6 mm". This expression can only be used when the units of each dimension are the same, or "The dimensions of the sheet used were 9 mm × 6 mm" or "The area of the sheet used was 54 mm2". Another example is the error "The flow rate was 10 mL · min? 1", the correct "The flow rate was 10 mL · min? 1", the original unit is "10 per mL per minute", the correct should be "10 mL per minute", and mL should not have a negative exponent. There are two situations where the unit name is expanded or abbreviated unnecessarily: when the sentence begins with a combination of "number+unit"; There are no numerical values before or after the unit. For example, "Nine N-m of torque was applied" is incorrect, while "Nine Newton meter of torque was applied" is correct. It is recommended to use "We applied 9 N-m of torque". For example, The velocity was measured in m/s is incorrect, but The velocity was measured in meters per second is correct. Here, only the unit is mentioned without a specific value, and abbreviations should not be used. The units of subject verb language are inconsistent. In scientific writing, the unit of measurement is considered a collective noun, and when written and pronounced in the plural but representing the singular, the predicate is in the singular. For example, "In order to produce 1 kg of aluminum, approximately 6.25 kg of recycled cans are needed" is incorrect, and "In order to produce 1 kg of aluminum, approximately 6.25 kg of recycled cans are needed" is correct. For example, "In this experiment, 2 mg of the extract was dissolved in 20 mL of water" is incorrect, but "In this experiment, 2 mg of t

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