Dry ice: extreme freeze

How to deepfreeze something without liquid nitrogen

Dry ice, or ex­treme freez­ing!

Safe­ty pre­cau­tions

  • Do not at­tempt!
  • Per­form this ex­per­i­ment only with pro­fes­sion­al su­per­vi­sion.

Reagents and equip­ment

  • glass con­tain­er;
  • dry ice - sol­id car­bon diox­ide;
  • iso­propyl al­co­hol;
  • flow­er;
  • can­dy;
  • ba­nana.

Step-by-step in­struc­tions

Put some dry ice in a glass con­tain­er and add some iso­propyl al­co­hol. The liq­uid’s tem­per­a­ture will drop rapid­ly. Im­merse a flow­er in the mix­ture and wait 1 minute. The flow­er prompt­ly freezes and can be crushed by hand or shat­tered with a ham­mer. Dip some can­dy into the cool­ing mix­ture – it turns from soft and stretchy into a cold аnd sol­id stone. The same thing hap­pens to a ba­nana. It’s a to­tal freeze!

Process de­scrip­tion

Dry ice is sol­id car­bon diox­ide. It forms at a tem­per­a­ture of -78.5 °C (-109°F). At room tem­per­a­ture, dry ice tran­si­tions rapid­ly from its sol­id to its gaseous state. Adding iso­propyl al­co­hol to dry ice makes the liq­uid cool very quick­ly ⏤ the mix­ture's tem­per­a­ture can reach -90°C (-130°F). At this point, the wa­ter in­side the flow­ers, can­dy, and ba­nana quick­ly freezes and turns into ice, mak­ing these ob­jects “stony.”