Convert mean powder grain size to microns #1702

Job	Run time
HIP (hipcc, Release, 4.2.00)	6m 14s
CUDA (nvcc, Release, 4.0.01)	8m 39s
CI (ubuntu:latest, g++, SERIAL, Debug, 4.0.01, Internal, None)	2m 41s
CI (ubuntu:latest, g++, SERIAL, Release, 4.0.01, Internal, None)	2m 28s
CI (ubuntu:latest, g++, OPENMP, Debug, 4.0.01, Internal, None)	2m 41s
CI (ubuntu:latest, g++, OPENMP, Release, 4.0.01, Internal, None)	2m 48s
CI (ubuntu:latest, clang++, SERIAL, Debug, 4.0.01, Internal, None)	2m 23s
CI (ubuntu:latest, clang++, SERIAL, Release, 4.0.01, Internal, None)	2m 10s
CI (ubuntu:latest, clang++, OPENMP, Debug, 4.0.01, Internal, None)	2m 39s
CI (ubuntu:latest, clang++, OPENMP, Release, 4.0.01, Internal, None)	2m 27s
CI (ubuntu:intel, icpx, SERIAL, Release, 4.0.01, External, None)	2m 55s
CI (ubuntu:intel, icpx, OPENMP, Release, 4.0.01, External, None)	30m 2s
CI (ubuntu:latest, g++, SERIAL, Debug, 4.0.01, External, None)	2m 34s
CI (ubuntu:latest, g++, SERIAL, Release, 4.0.01, External, Finch)	3m 7s
	1h 13m 48s

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