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--- demonstrations:9_equipment:liquid_nitrogen_dewar:start [2019/03/04 18:53] – demoroom
+++ demonstrations:9_equipment:liquid_nitrogen_dewar:start [2019/04/13 00:16] (current) – demoroom
@@ Line 15: / Line 15: @@
 ===== Notes =====
-Liquid nitrogen can be stored in the Dewar for a surprisingly long time, but it does gradually boil off. (The insulation is very good but obviously not perfect. A small amount is continually vaporized so the liquid remains below the boiling point.)
+If you want some liquid nitrogen for a demonstration please contact the demo room in advance. Unless it's specifically requested we don't keep liquid nitrogen in the demo room. When it's needed, it's picked up from the chemistry building.
-<WRAP center round important 40%>
+Liquid nitrogen can be stored in the Dewar for a surprisingly long time, but it does gradually boil off.((The insulation is very good but (obviously) not perfect. A small amount is continually vaporized so the liquid remains below the boiling point.))
-Use gloves and goggles at all times while working with liquid nitrogen. The Leidenfrost effect means that small quantities will roll harmlessly across your skin, but if any is allowed to soak into fabric or pool on your skin, you may suffer severe frostbite.
+<WRAP round important 40%>
+Use gloves and goggles at all times while working with liquid nitrogen. The Leidenfrost effect means that small quantities will roll harmlessly across your skin, but if any is allowed to soak into fabric or pool on your skin you may suffer severe frostbite.
 </WRAP>