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.
A rocket is a missile, spacecraft, aircraft or other vehicle that obtains thrust from a rocket engine. Rocket engine exhaust is formed entirely from propellant carried within the rocket before use. Rocket engines work by action and reaction and push rockets forward simply by expelling their exhaust in the opposite direction at high speed, and can therefore work in the vacuum of space. In fact, rockets work more efficiently in space than in an atmosphere. Multistage rockets are capable of attaini