What is the difference between 1M and 1MM?

Answer 1

M or Molarity is what is used to describe the concentration af acids. 1 M means that there is one mole of substance per every liter of sulution so if the molarity of HCl (hydrochloric acid) is 1 then there is 1 mole of HCl per every liter of the hydrochloric acid.

Answer 2

1M and 1MM are the proper expressions for large numbers in abbreviated form for specific references (e.g. $1M is $1,000 and $1MM is $1,000,000.)

$1k representing $1,000 is grammatically incorrect, but has become acceptable to use in informal situations like news headlines.

From the Latin mille for 1000. the M is also seen with an overstrike or overbar to represent that the preceding number should be multiplied by 1000. MM (also seen with overstrikes) means that the preceding number should be multiplied by 1000 and again by 1000 (i.e. 1,000,000). The M should be used with numbers related to intangible and conceptual subjects like money, time, and counting. Related to the M is the k which is the abbreviation for kilo-. The k abbreviation should be used with tangible and physical subjects like distance and weight.

Usage: The abbreviation for $100,000 is $100M.

The abbreviation for $1,000,000 is $1MM.

In the milliontreesNYC project over 521M trees have been planted so far.

Answer 3

1M typically represents one million, while 1MM can either represent one million or one thousand depending on the context. It is important to clarify the unit of measure when using these abbreviations to avoid confusion.