Get Surfshark VPN at https://Surfshark.deals/HYPERSPACEPIRATE and enter promo code HYPERSPACEPIRATE for a Holiday Special offer of 5 extra months for free with the Surfshark One package! In this video I'm going to turn seashells into dry ice. Sea shells are mostly made up of limestone - or Calcium Carbonate (CaCO3), which can be decomposed into Calcium Oxide (CaO) and Carbon Dioxide (CO2) when heated to around 900C. I used a 500W induction heater i built to heat a sealed pipe full of sea shells to a hot enough temperature and collected the CO2 gas into a beach ball by using a vacuum pump to extract it from the pipe. For limestone decomposition to occur at a reasonably fast rate, the temperature really needs to be over ~1000C, so this process took several hours (even for only ~50 grams of limestone) and required a vacuum pump to pull off the CO2. I broke down the remainder of my sea shells by dissolving them in vinnegar, and saved the Calcium Acetate biproduct for later use as a solid fuel for camping/hiking. Once I collected a decent volume of CO2, I used a refrigeration compressor to pump it into a plate-stack heat exchanger and used a propane-based vapor compression refrigeration system to chill the high pressure CO2 down to about -30C, so it required only modest pressure to liquify. The refrigeration system is actually the pre-cooler stage for my joule-thomson cryocooler, which i borrowed for this video. Once a decent mass of CO2 has been pumped into the heat exchanger and liquified, it's discharged through a ~1mm diameter capillary tube into a thermos with a glass wool baffle to stop high speed gases from carrying away tiny particles of the ice. With a little bit of improvement to the limestone furnace temperature, and some minor tweaks to my refrigeration system, this could be an extremely cheap way to make dry ice, assuming a limestone source is available. With the right setup, costs could be as low as a few cents per pound of ice. Induction Heater Schematic: https://drive.google.com/file/d/1WWGMMiXeocOpjPDXXiNxOdZxMykq30Rp/view?usp=sharing Music Used: Kevin MacLeod - George Street Shuffle Kevin MacLeod - Groove Groove Kevin MacLeod - Lobby Time