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FEV1/FVC ratio (FEV1%)

FEV1/FVC (FEV1%) is the ratio of Forced expiratory volume in 1 second ( the volume of air that can forcibly be blown out in one ... more

Compression ratio

The compression ratio of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion ... more

Energy Density of electric and magnetic fields

Energy density is the amount of energy stored in a given system or region of space per unit volume or mass, though the latter is more accurately termed ... more

Characteristic Length

In physics, a characteristic length is an important dimension that defines the scale of a physical system. Often, such a length is used as an input to a ... more

Number density (Relation to Molar concentration)

Number density is an intensive quantity used to describe the degree of concentration of countable objects. For any substance, the number density n can be ... more

Tritration ( concentration of the analyte)

Titration, also known as titrimetry or volumetric analysis, is a common laboratory method of quantitative chemical analysis that is used to determine the ... more

Vacuum Evacuation Time

The evacuation time for a vacuum pump can be calculated as shown

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Avogadro's law

Avogadro’s law is an experimental gas law relating volume of a gas to the amount of substance of gas present. Avogadro’s law states that, ... more

Heat-affected zone - heat input for arc welding

The cross-section of a welded butt joint, with the darkest gray representing the weld or fusion zone, the medium gray the heat affected zone, and the ... more

Boyle's law

Boyle’s law is an experimental gas law which describes how the pressure of a gas tends to decrease as the volume of a gas increases. The absolute ... more

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