There is little value in comparing a mass meter output with that of a volume tank. without a measure of density to allow conversion between mass and volume. For flow measurement, the standard is a. system comprising of a measure of quantity and the subsidiary measurements to determine the fluid conditions, properties. and influence factors. Another feature of the standard is that there must be confidence. that the measurement taken by the standard is accurate.
Ravenclaw values intelligence, creativity, learning, and wit. The house mascot is an eagle and the house colours are blue and bronze (blue and grey in the films). The head of this house is the Charms professor, Filius Flitwick, and the house ghost is The Grey Lady. According to Rowling, Ravenclaw corresponds roughly to the element of air.
The main floor. Ravenclaws enter the main floor by answering a riddle. A brass eagle knocker then transform into a crystal eagle, revealing the common room behind it when the riddle is correctly answered. A crystal farm sits in the middle of the room, with counters for experiments and studies.