How is the density of smoke measured?

The density of smoke is measured using an opacimeter or Ringleman chart because these tools specifically assess the amount of light obscured by smoke, which directly relates to its density. An opacimeter measures the transmissivity of light through a sample of smoke, providing a quantitative value of density based on how much light is absorbed or scattered. The Ringleman chart, on the other hand, is a visual reference that allows the observer to compare the color and opacity of smoke against standard reference values, correlating them with density levels.

These methods are particularly relevant in environmental monitoring and industrial processes, where understanding smoke density is essential for compliance with air quality regulations and understanding the potential impact on health and the environment.

In contrast, a thermometer is designed to measure temperature, a barometer measures atmospheric pressure, and a smoke meter, while related, typically refers to specific devices that may not directly measure density but rather monitor emissions or particulate concentration, making these options less suitable for the specific measurement of smoke density.