All propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. â¦ If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.ll propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. â¦ If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.
Although it is passed down from parents to children, about 1/3 of cases are caused by a spontaneous mutation, a change in a gene. According to the US Centers for Disease Control and Prevention, hemophilia occurs in approximately 1 in 5,000 live births. There are about 20,000 people with hemophilia in the US. All races and ethnic groups are affected. Hemophilia A is four times as common as hemophilia B while more than half of patients with hemophilia A have the severe form of hemophilia.
Inherited hemophilia. In 70% of cases of hemophilia, there is a known family history. The gene that causes hemophilia is passed from mother to child. A mother that carries the gene is called a carrier. A carrier has a 50% chance of having a son with hemophilia and a 50% chance of having a daughter who is also a carrier.In other words, a female carrier has a 25% chance of having a child with hemophilia. female can have Hemophilia because of X-inactivation or Lyonization. It is possible for one X to âshut-downâ or not to express itself. If the X chromosome with the Hemophilia gene is the active chromosome than she will have lower levels. 50% of carriers have low factor levels.