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For example, 45% (read as "forty-five percent") is equal to the fraction 45 / 100 , the ratio 45:55 (or 45:100 when comparing to the total rather than the other portion), or 0.45. Percentages are often used to express a proportionate part of a total.
Volume percent is the concentration of a certain solute, measured by volume, in a solution.It has as a denominator the volume of the mixture itself, as usual for expressions of concentration, [2] rather than the total of all the individual components’ volumes prior to mixing:
In chemistry, the mass concentration ρ i (or γ i) is defined as the mass of a constituent m i divided by the volume of the mixture V. [1]= For a pure chemical the mass concentration equals its density (mass divided by volume); thus the mass concentration of a component in a mixture can be called the density of a component in a mixture.
Volume fraction, which is widely used in chemistry (commonly denoted as v/v), is defined as the volume of a particular component divided by the sum of all components ...
The photosynthetic efficiency is the fraction of light energy converted into chemical energy during photosynthesis in green plants and algae. Photosynthesis can be described by the simplified chemical reaction 6 H 2 O + 6 CO 2 + energy → C 6 H 12 O 6 + 6 O 2
In 1849, Charles Blachford Mansfield rectified coal tar and identified fractions which he hypothesized to be cumole and cymole. The latter fraction boiled slightly above 170°C and had specific density of 0.857. [3] In 1862, Warren De la Rue and Hugo Müller (1833-1915) proposed the term pseudocumole for the fractions heavier than xylole. [4]
NASA's budget as percentage of federal total, from 1958 to 2017. NASA's budget for financial year (FY) 2020 is $22.6 billion. [1] It represents 0.48% of the $4.7 trillion the United States plans to spend in the fiscal year.
The demographics of sexual orientation and gender identity in the United States have been studied in the social sciences in recent decades. A 2023 Gallup poll concluded that 7.6% of adult Americans identified as LGBTQ+. [1]