Suffocation products kill lice by plugging their airways (called spiracles). This treatment group is made up of some common household items like mayonnaise and Vaseline, as well as commercial products that often use silicone-based active ingredients. Suffocation products can be quite time-consuming and messy.
240 Internal Combustion Engines Chap. 4 The work done on a gas element by this compression is p dV. Because the volume ofamass of burned gas is larger than that of an equal mass of unburned gas, more work isdone on the gas that bums early in the cycle than is done on that that bums at a latertime.
How Automobile Ignition Systems Work. The spark plug is in the center of the four valves in each cylinder. Â­The spark plug is quite simple in theory: It forces electricity to arc across a gap, just like a bolt of lightning. The electricity must be at a very high voltage in order to travel across the gap and create a good spark.