The objective of grinding the samples is to obtain a homogeneous sample with particles measuring approximately 4 mm. Grinding to achieve this particle size should take no more than 3 minutes.
(The objective of grinding the samples; is; to obtain a homogeneous sample with particles) (particles; measuring; approximately 4 mm)
The objective of grinding the samples particles
is measuring
to obtain a homogeneous sample with particles
approximately 4 mm