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than 24 hrs) is the commonly accepted definition of oven dry and the
standard used for moisture measurements. The moisture still held in a soil
after that treatment is very small. After the sample is dried, it should be

cooled before reweighing because the sample heat will create convection
currents which will affect sensitive balances. However, cooling in a moist

atmosphere will allow the hot soil to absorb moisture. Thus, the dried sample
should be cooled in the dry atmosphere of a desiccators and/or with the

sample container lid on. Soil samples for gravimetric moisture
determinations can be collected with a shovel or spade (surface samples),

soil augers, or manually inserted, hammer driven, or hydraulically inserted
soil sampling tubes.

3.3 Apparatus/Equipments

 Auger, soil sampling tube, or other suitable device for: collecting soil
samples at the appropriate depth

 oven regulated 105 C
o

 Balance

 soil cans with tight-fitting lids

 Gloves

 Spatula

24 | Soil Engineering Practical Workbook