Heat Shrink Tubing, also called heat shrinkable tubing, is a tube that contracts when warmed. When heat is applied to the heat shrink tubing, the adhesive material inside of the tube is activated.The adhesive material then secures it to the wire or cable. The process allows the wire or cable and the heat shrink tubing to become one unified product. 2:1 - This heat shrink tubing will become half of its original size once heat is applied. 2  The original heat shrinkable tubing is twice as large as its shrunken form. 3  3:1 - This heat shrink tubing will be one third of its original size once heat is applied.
Biologically, conception is the moment when a sperm cell from a male breaches the ovum, or egg, from a female. The process is also known as fertilization and is the initial stage of development for human growth.
Conception is also the beginning of the germinal period of prenatal development. This stage occurs during the first 2 weeks of development (or the 2nd - 4th weeks of pregnancy). The union of the sperm and egg cell forms a single cell called a zygote. The zygote moves along the Fallopian tube toward the uterus.