Carbon dioxide (CO 2) is usually pumped as a liquid, usually below 5Â°C (41Â°F) and a pressure of about 50 bar. The solvent is pumped as a liquid as it is then almost incompressible; if it was pumped as a supercritical fluid, much of the pump stroke would be used up in compressing the fluid, rather than pumping it.
The word lice is plural for louse. Head lice are spread by personal contact or the sharing of combs, brushes, caps, and other clothing. Head lice are a common problem with preschool and schoolchildren. Head lice cause a tickling feeling of something moving in the hair, itching, and sores on the head.
There are 3 stages in the life of lice: nit (egg), nymph, and adult. Adult lice lay nits and stick them to hair strands or clothing fibers. Nits look like tiny pieces of dandruff that cannot be brushed off. Nymphs hatch from nits in 7 to 10 days. They are clear in color and feed on scalp blood.