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--- demonstrations:2_fluid_mechanics:2b_statics_of_fluids:magdeburg_hemispheres:start [2019/02/14 23:33] – external edit 127.0.0.1
+++ demonstrations:2_fluid_mechanics:2b_statics_of_fluids:magdeburg_hemispheres:start [2020/03/13 20:58] (current) – demoroom
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 ====== Magdeburg Hemispheres ======
-{{tag> needs_review untagged unlocated}}
+{{tag> pressure fluid_mechanics force vacuum located}}
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 ===== Description =====
-Demonstrates the power of atmospheric pressure    Classes Used: Phys 101
+Consists of a pair of hollow brass hemisphere with a handle on each. There's a gasket around the circumference, so that when they're put together they make a seal. When put together, the air inside may be evacuated with a pipe fitting and a valve.
-Parts Needed:
-- Hemispheres
-- Vacuum pump
 ===== Purpose =====
+Demonstrates the power of atmospheric pressure.
 ===== Apparatus =====
+  * Magdeburg Hemispheres
+  * [[demonstrations:9_equipment:vacuum_pump_handheld:start|Handheld vacuum pump]] (or [[demonstrations:9_equipment:vacuum_pump_electric:start|the electric vacuum pump]], if you're using it anyway)
 ===== Setup =====
+  - While holding the hemispheres together, use the vacuum pump to evacuate the space between them. Make sure the valve is open. If you're using the handheld vacuum pump, this is easiest if you hold the hemispheres together with one hand and pump the vacuum pump with the other.
+  - Close the valve and disconnect the pump. ((The valve is open when the haft is vertical, the valve is closed when the haft is horizontal))
-. While holding the hemispheres together, use the vacuum pump to evacuate the enclosure.
+  - The sphere can now hold up to 5 kg. It can be pulled apart by hand, but only with some effort.
-. Turn the valve and disconnect the pump to lock the spheres.
+  - To unlock the spheres, open the valve.
-(PS. the valve is open when the haft is vertical, the valve is closed when the haft is horizontal)
-. The sphere can now hold up to 5 kg.
-. to unlock the spheres, turn the valve.
-*
 ===== Notes =====
-Vacuum Pump needed for this demo can be found in the bottom left corner of the Yellow Closet
+Suction cups can be thought of as Magdeburg Hemispheres that create their own vacuum in the action of pressing them onto a surface.
-Updated on: May 11th, 2015
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-| **Location** | ---- |
+| **Location** | C4 |
 | **Maker** | Unknown |
 | **Current State** | Working |