Review
¥ELR-Environmental Lapse Rate
¥ Temp change w/height measured by a thermometer hanging from a balloon
¥ DAR and MAR are Temp change w/height    for an air parcel (i.e. the air inside balloon)
¥Why Do Supercooled Water Droplets Exist?
¥ Freezing needs embryo ice crystal
¥ First one, in pure water, is difficult to make