Skip to main content

Novel Coronavirus — July 23, 2021 Update: Explore Scouts Canada’s actions as we continue to follow the direction of government and health agencies in maintaining public health. View recommendations and stay informed here.

NOTE: All Scouts Canada Staff will be on summer break from Monday, July 26 to Tuesday August 3. All offices are closed.

Astronaut Training: Station 1 - Water-Cooled Underwear

Learn about how the cooling system in an Extravehicular Mobility Unit (EMU) works.

Back to Activity Finder


  • What materials will you need for this activity? Where will you get these materials?
  • Where will you get the water for this activity?
  • How can you make sure not to make a mess while doing this activity?


  • Wrap your bare arm with the plastic tubing.
  • Grasp the end of the tube and point it toward the plastic container on the ground
  • Place the opposite end of the tube into the plastic container full of water on the table.
  • To feel like you are wearing a garment with the tube sewn in (like the liquid cooling and ventilation garment that astronauts wear), you can slide a sock with the toes cut out over your arm and wrap the tube around it.
  • Attach the siphon bulb pump to the bottom end of the tube.
  • Make sure the siphon bulb’s outlet is pointed toward the container on the floor.
  • Start a siphon from the water container through the tube by pumping the siphon bulb until water begins to flow.


  • Did you notice a temperature change?
  • Spacesuits are designed to be very well-insulated, so why is a water-cooling system necessary?
  • When would an astronaut on a space-walk want to increase the amount of cooling?
  • What would it be like if the tube were wrapped all around your body?
  • Is there anything about this simulation that would not work in space?
  • How could you improve this design to ensure it worked in microgravity? (e.g. The siphon wouldn’t work in space because there is no gravity to “power” the siphon, so the water must be pumped through the LCVG).


  • Work gloves or hockey gloves 
  • Other than the gloves, there are not any specific materials you need – you can choose tasks based on the skill level of your group, or based on the materials you have.

Keep it Simple

  • Some youth may not have the same motor skills as others, so you may need to have tasks in a variety of difficulties. Try to have at least one task that everyone will be able to do.
  • Wearing thinner gloves will make the activities easier – if you have youth who struggle with fine motor skills, try having them wear a thinner pair of gloves.

Take it Further

  • Try choosing harder tasks, like making a friendship bracelet, knitting or opening a small bottle.