Correct option is D
The
pour point of a fuel is the
lowest temperature at which it remains fluid and can still flow under gravity. Below this temperature, the fuel becomes highly viscous, turning into a semi-solid state and
loses its ability to flow.
This property is critical for fuels used in
cold environments, such as diesel and lubricating oils, as it determines their usability at low temperatures.
Factors Affecting Pour Point:
· The
presence of wax in fuels (especially in diesel and heavy oils) causes solidification at low temperatures.
· Higher
paraffin content increases the pour point.
· Additives (such as pour point depressants) can lower the pour point to improve cold-weather performance.
