백만 분의 일의 비율을 나타내는 미량 물질의 농도 단위.
A unit of concentration that expresses the amount of a substance in one million parts of another, such as a liquid or gas.
예문:
"The concentration of chlorine in the pool should be kept between 1 and 3 ppm."
"Scientists reported that the atmospheric methane reached a record high of 1.9 ppm."
프린터나 복사기가 1분 동안 인쇄할 수 있는 종이의 매수를 나타내는 단위.
A measure of the printing speed of a printer or photocopier, indicating how many pages can be produced in one minute.
예문:
"The new inkjet printer can reach speeds of up to 20 ppm in draft mode."
"A higher ppm value generally indicates a more efficient printer for high-volume tasks."