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.
Like many other engines, a rocket produces thrust by burning fuel. Most rocket engines turn the fuel into hot gas. Pushing the gas out of the back of the engine makes the rocket move forward. A rocket is different from a jet engine. A jet engine requires oxygen from the air to work. A rocket engine carries everything it needs. That is why a rocket engine works in space, where there is no air.