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In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63] For instance, pH is the decimal cologarithm of the activity of hydronium ions (the form hydrogen ions H + take in water). [64] The activity of hydronium ions in neutral water is 10 −7 mol·L −1, hence a pH of 7. Vinegar typically ...
By definition, pOH is the negative logarithm (to the base 10) of the hydroxide ion concentration (mol/L). pOH values can be derived from pH measurements and vice-versa. The concentration of hydroxide ions in water is related to the concentration of hydrogen ions by
A CD-ROM can easily store the entirety of a paper encyclopedia's words and images, plus audio and video clips. Volume or capacity of data is often compared to works of literature or large collections of writing. Popular units include the Bible, the Encyclopædia Britannica, phone books, the complete works of Shakespeare, and the Library of ...
The decimal expansion of the golden ratio [1] has been calculated to an accuracy of ten trillion ( = ) digits. [ 66 ] In the complex plane , the fifth roots of unity z = e 2 π k i / 5 {\displaystyle \textstyle z=e^{2\pi ki/5}} (for an integer k {\displaystyle k} ) satisfying z 5 = 1 {\displaystyle \textstyle z ...
For example, the decimal number 205 is the sum of two hundreds and five ones, with the 0 digit indicating that no tens are added. The digit plays the same role in decimal fractions and in the decimal representation of other real numbers (indicating whether any tenths, hundredths, thousandths, etc., are present) and in bases other than 10 (for ...
January 14, 1997 HTML 3.2 [16] was published as a W3C Recommendation.It was the first version developed and standardized exclusively by the W3C, as the IETF had closed its HTML Working Group on September 12, 1996.
The IHL field contains the size of the IPv4 header; it has 4 bits that specify the number of 32-bit words in the header. The minimum value for this field is 5, [33] which indicates a length of 5 × 32 bits = 160 bits = 20 bytes. As a 4-bit field, the maximum value is 15; this means that the maximum size of the IPv4 header is 15 × 32 bits = 480 ...