So you can now understand what is a part per million. ppm in this context probably means parts per million. This is the concentration of a chemical or element in something like food or drink. for example 8 milligrams of mercury in 100 grams of fish would result in a mercury concentration of 0.8 ppm (parts per million)
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THE CAT is a classic example of context effect. We have little trouble reading H and A in their appropriate contexts, even though they take on the same form in each word. A context effect is an aspect of cognitive psychology that describes the influence of environmental factors on one's perception of a stimulus. The impact of context effects is considered to be part of top-down design. The concept is supported by the theoretical approach to perception known as constructive perception.