Processes and techniques which may result in a gas accumulation. The following circumstances may result in the unintentional build-up of asphyxiant gases in confined spaces. During MIG, MAG or TIG welding on the outside of fabrications, torch shielding gas can enter the fabrication through the weld root.
So here's how to make paper mache glue from water and flour so they can get their hands messy. What you need. Activity. Mix one part flour with one part of water (eg, 1 cup flour and 1 cup water, or 1/2 cup flour and 1/2 cup water) until you get a thick glue-like consistency. Add a bit more water if itâs too thick. Mix well with a spoon to get rid of all the lumps.
Without minerals you could not put pen to paper. The writing tips of pens are made with a strong metal called tungsten which comes from wolframite and scheelite ores. Think about the properties of tungsten: Strong; Rigid; Impermeable; You can see why we make pen nibs from tungsten. Paper is usually made of wood pulp mixed with minerals like clays, mica, talc and baryte. Lead pencils do not contain lead. The 'lead' is made of a mixture of clay and a mineral called graphite - a form of carbon. Think about the properties of graphite: Soft ; Easily powdered ; Opaque (not see-through) You can see why we make pencils from graphite.