In a four-stroke internal combustion engine, the gas vapor/air mixture is pressurized during the ____ stroke.

compression
power
intake
exhaust

In a four internal combustion engine,the gas vapor/air mixture is pressurized during what stroke

In a four-stroke internal combustion engine, the gas vapor/air mixture is pressurized during the compression stroke.

To understand why this is the correct answer, let's first briefly go over how a four-stroke engine works. A four-stroke internal combustion engine goes through four distinct strokes: intake, compression, power, and exhaust.

During the intake stroke, the piston moves downward, creating a vacuum in the cylinder. This allows the intake valve to open, and the gas vapor/air mixture is drawn into the cylinder.

During the compression stroke, the piston moves upward, compressing the gas vapor/air mixture in the cylinder. This compression increases the pressure and temperature of the mixture.

During the power stroke, the compressed mixture is ignited by a spark plug. The resulting combustion expands rapidly, pushing the piston downward, converting the chemical energy of the fuel into mechanical energy.

During the exhaust stroke, the piston moves upward again, expelling the burned gases from the cylinder. The exhaust valve opens, allowing the gases to exit the cylinder.

Now, let's focus on the compression stroke. This stroke occurs after the intake stroke and before the power stroke. During the compression stroke, the piston moves upward, compressing the gas vapor/air mixture in the cylinder. This compression increases the pressure and temperature of the mixture, creating the ideal conditions for combustion to occur efficiently during the power stroke.

Therefore, in a four-stroke internal combustion engine, the gas vapor/air mixture is pressurized during the compression stroke.