York. Shetland Islands. High School and College Directory: a b c d e f g h i j k l m n o p q r s t u v w x y z #. Teacher and Professor Directory: a b c d e f g h i j k l m n o p q r s t u v w x y z. Copyright 2001-2015 RateMyTeachers.com.All Rights Reserved.igh School and College Directory: a b c d e f g h i j k l m n o p q r s t u v w x y z #. Teacher and Professor Directory: a b c d e f g h i j k l m n o p q r s t u v w x y z. Copyright 2001-2015 RateMyTeachers.com.
Helium is commercially recovered from natural gas deposits, mostly from Texas, Oklahoma and Kansas. Helium gas is used to inflate blimps, scientific balloons and party balloons. It is used as an inert shield for arc welding, to pressurize the fuel tanks of liquid fueled rockets and in supersonic windtunnels.
A. There are three types of balloons: latex, foil and bubble. Latex balloons are made from a completely natural substance: the sap of rubber trees. Foil balloons are made of nylon covered with a metallic layer of aluminium. Bubbles are made with a stretchy plastic.