Fahrenheit He then re-calibrated his scale using the melting point of ice and normal human body temperature (which were at 30 and 90 degrees); he adjusted the scale so that the melting point of ice would be 32 degrees and body temperature 96 degrees, so that 64 intervals would separate the two, allowing him to mark degree lines on his instruments by simply bisecting the interval six times (since 64 is 2 to the sixth power). Fahrenheit observed that water boils at about 212 degrees using this scale. The use of the freezing and boiling points of water as thermometer fixed
× Pachyveria glauca 'Little Jewel' best in desert and arid climates, and grow well in porous, well-drained soil. They grow well in full sun, though prefer a bit of shade in more sizzling heat of 92 and higher degrees Fahrenheit (33 degrees Celsius). They are drought and heat wave tolerant, but love lots of summer time water, and hardy to around 30-35 degrees Fahrenheit (-1 to 1 degrees Celsius). × Pachyveria glauca 'Little Jewel' "× Pachyveria glauca" 'Little Jewel' succulent plants are hybrids in the nothogenus × "Pachyveria" ("Pachyphytum" and "Echeveria"). It is a versatile plant, thriving in the (frost free) garden and in containers.