Asieve tray is to be designed for the following application: vapour rate 32 000 kg/h liquid rate 30 000 kg/h vapour density 1.95 kg/m3 liquid density 955 kg/m3 surface tension 0.025 n/m the design requires a vapour velocity which is 75-80% of the flooding value and a turn-down ratio of 70% an existing single-pass sieve tray is available. the dimensions of the tray are given below: column diameter (m) 2.0 downcomer area (m2) 12 % of total area hole area 10% of active area hole diameter (mm) 5 weir height (mm) 50 weir length (m) 1.54 tray spacing (m) 0.5 tray thickness (mm) 5 rate the configuration by determining  whether the specified liquid arrangement is suitable.  the flooding velocity and the actual velocity based on the net area.  whether entrainment and weeping will be an issue.  the tray pressure drop is acceptable or not.  whether the tray spacing is acceptable by calculating the downcomer back-up.  whether the residence time is acceptable.

i think it is d. e because the next one is igneous.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).