BS EN ISO 80000-8:2020 pdf free.Quantities and units,Acoustics.
BS EN ISO 80000-8 This document gives names, symbols, definitions and units for quantities of acoustics. W here appropriate, conversion factors are also given. 2 Normative references
There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the fllowing terms and definitions apply. Names, symbols, definitions and units for quantities used in acoustics are given in Table 1.ISO and IEC maintain terminological databases for use in standardization at the following addresses  sound particle material element smallest element of the medium that represents the medium’s mean density [SOURCE: ISO 18405:2017, 3.1.1.5, modified – Note 1 to entry deleted.] 4 Remark on the use of the symbols lb and lg In accordance with IS0 80000-2, the abbreviations Ib and lg are used to indicate logarithms to the base 2 (log2) and base 10 (log10), respectively.The reference value of sound power is given by Po= 1 pW. When stating a value of sound power level, the reference value shall be specified.The value of sound power level depends on the selected frequency range and time duration. When stating a value of sound power level, the frequency range and time duration shall be specified. In accordance with ISO 80000-1, any attachment to the unit symbol as a means of giving infor-mation about the special nature of the quantity or context of measurement under considera- tion is not permitted. If specific frequency and time weightings as specified in IEC 61672-1 or specific frequency bands or time duration are applied, this should be indicated by appropriate subscripts to the quantity symbol.The value of sound pressure level depends on the selected frequency range and time duration. When stating a value of sound pressure level, the frequency range and time duration shall be specified.In accordance with ISO 80000-1, any attachment to the unit symbol as a means of giving infor-mation about the special nature of the quantity or context of measurement under consideration is not permitted.
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