Distinguish between viscosity and flash point of fuel oil.

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Multiple Choice

Distinguish between viscosity and flash point of fuel oil.

Viscosity describes how thick a liquid is and how much it resists flowing. It affects how fuel moves through pumps and pipes and how it sprays or atomizes in an engine or burner; it changes with temperature—warmer fuel flows more easily, cooler fuel thickens. Flash point is about safety and flammability. It’s the lowest temperature at which the fuel’s vapors can ignite when exposed to an ignition source. It isn’t the temperature at which fuel will ignite on its own, and it isn’t a measure of how “hot” the fuel must get to burn in general; it’s specifically about the vapor near the surface and ignition risk. So the correct idea is that viscosity measures flow resistance, while flash point indicates the temperature at which vapors may ignite.

Viscosity describes how thick a liquid is and how much it resists flowing. It affects how fuel moves through pumps and pipes and how it sprays or atomizes in an engine or burner; it changes with temperature—warmer fuel flows more easily, cooler fuel thickens.

Flash point is about safety and flammability. It’s the lowest temperature at which the fuel’s vapors can ignite when exposed to an ignition source. It isn’t the temperature at which fuel will ignite on its own, and it isn’t a measure of how “hot” the fuel must get to burn in general; it’s specifically about the vapor near the surface and ignition risk.

So the correct idea is that viscosity measures flow resistance, while flash point indicates the temperature at which vapors may ignite.

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