Here is a fully off the shelf parts list on how you can make a test of whether rockets work in space or not. The idea is to use a CO2 cartridge which has a measured amount of gas and will work in atmosphere or a vacuum chamber. A simple balloon experiment cannot work in a vacuum chamber since it will make the rubber expand. In this experiment a co2 cartridge is used and remotely opened. A USB load cell is used to measure the force generated. For the vacuum a 15 gallon vacuum chamber is used which will provide 57 liters. A 12 gram co2 cartridge will create 6 liters of gas. This is nearly a 10x larger vacuum chamber than the gas in the canister so if rockets don't work in space, we should definitly see less force generated in the vacuum chamber from the co2 cartridge than outside the vacuum chamber. Give it a shot!
Video:
https://m.youtube.com/watch?v=U2cfl3NLdtY
15 gallon vacuum chamber
https://www.ebay.com/itm/Best-Value-Vacs-BVV-15-Gallon-Aluminum-Vacuum-Degassing-Chamber-Acrylic-Lid/302817133611?hash=item46814ec42b:g:hv8AAOSwqz9bVs8~
Vacuum pump
https://www.ebay.com/itm/3-5-CFM-Rotary-Vane-Vacuum-Pump-1-4HP-HVAC-R134a-Air-Refrigerant-Conditioning/131845616776?epid=11021421163&hash=item1eb29c7488
Load cell usb
https://www.800loadcel.com/electronics/digital-displays/usb-load-cell.html
Load cell usb cell
https://www.800loadcel.com/load-cells/single-point-load-cells/load-cell-gcb3-ss.html
Rf relay switch
https://www.amazon.com/gp/aw/d/B01JGDV8UM/ref=ox_sc_act_image_1?smid=A2W4C0WITD9CS7&psc=1
Threaded co2
https://www.amazon.com/gp/aw/d/B000660N1O/ref=ox_sc_act_image_2?smid=ATVPDKIKX0DER&psc=1
Inflator head
https://www.amazon.com/gp/aw/d/B000RYBGAC/ref=ox_sc_act_image_3?smid=A1DYHG7ZNG7ZDH&psc=1
12v 1/4" solenoid
https://www.amazon.com/gp/aw/d/B00KKIH1YK/ref=ox_sc_act_image_4?smid=A1QBR7C00JLS39&psc=1
Nozzle
https://www.amazon.com/Anderson-Metals-57001-0404-Fitting-Adapter/dp/B002SAO7XQ/ref=pd_aw_fbt_60_img_2?_encoding=UTF8&pd_rd_i=B002SAO7XQ&pd_rd_r=79e98345-ea06-11e8-b5f3-4fa8805058f7&pd_rd_w=UgqBK&pd_rd_wg=vCCr3&pf_rd_i=mobile-dp-sims&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=b98fa1a4-6e6e-4981-835c-7fb29e0f4dd2&pf_rd_r=GX0P2H119M3ZK6BR7C6Z&pf_rd_s=mobile-dp-sims&pf_rd_t=40701&psc=1&refRID=GX0P2H119M3ZK6BR7C6Z
Video:
https://m.youtube.com/watch?v=U2cfl3NLdtY
15 gallon vacuum chamber
https://www.ebay.com/itm/Best-Value-Vacs-BVV-15-Gallon-Aluminum-Vacuum-Degassing-Chamber-Acrylic-Lid/302817133611?hash=item46814ec42b:g:hv8AAOSwqz9bVs8~
Vacuum pump
https://www.ebay.com/itm/3-5-CFM-Rotary-Vane-Vacuum-Pump-1-4HP-HVAC-R134a-Air-Refrigerant-Conditioning/131845616776?epid=11021421163&hash=item1eb29c7488
Load cell usb
https://www.800loadcel.com/electronics/digital-displays/usb-load-cell.html
Load cell usb cell
https://www.800loadcel.com/load-cells/single-point-load-cells/load-cell-gcb3-ss.html
Rf relay switch
https://www.amazon.com/gp/aw/d/B01JGDV8UM/ref=ox_sc_act_image_1?smid=A2W4C0WITD9CS7&psc=1
Threaded co2
https://www.amazon.com/gp/aw/d/B000660N1O/ref=ox_sc_act_image_2?smid=ATVPDKIKX0DER&psc=1
Inflator head
https://www.amazon.com/gp/aw/d/B000RYBGAC/ref=ox_sc_act_image_3?smid=A1DYHG7ZNG7ZDH&psc=1
12v 1/4" solenoid
https://www.amazon.com/gp/aw/d/B00KKIH1YK/ref=ox_sc_act_image_4?smid=A1QBR7C00JLS39&psc=1
Nozzle
https://www.amazon.com/Anderson-Metals-57001-0404-Fitting-Adapter/dp/B002SAO7XQ/ref=pd_aw_fbt_60_img_2?_encoding=UTF8&pd_rd_i=B002SAO7XQ&pd_rd_r=79e98345-ea06-11e8-b5f3-4fa8805058f7&pd_rd_w=UgqBK&pd_rd_wg=vCCr3&pf_rd_i=mobile-dp-sims&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=b98fa1a4-6e6e-4981-835c-7fb29e0f4dd2&pf_rd_r=GX0P2H119M3ZK6BR7C6Z&pf_rd_s=mobile-dp-sims&pf_rd_t=40701&psc=1&refRID=GX0P2H119M3ZK6BR7C6Z
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