WordNet

paint (a surface) to make it look like stone or wood
dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn (同)caryopsis
a weight unit used for pearls or diamonds: 50 mg or 1/4 carat (同)metric grain
1/60 dram; equals an avoirdupois grain or 64.799 milligrams
1/7000 pound; equals a troy grain or 64.799 milligrams
a cereal grass; "wheat is a grain that is grown in Kansas"
the side of leather from which the hair has been removed
the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric; "saw the board across the grain"
the smallest possible unit of anything; "there was a grain of truth in what he said"; "he does not have a grain of sense"
foodstuff prepared from the starchy grains of cereal grasses (同)food grain, cereal
a relatively small granular particle of a substance; "a grain of sand"; "a grain of sugar"
sort according to size
the actual state of affairs; "thats the size of the situation"; "she hates me, thats about the size of it" (同)size of it
any glutinous material used to fill pores in surfaces or to stiffen fabrics; "size gives body to a fabric" (同)sizing
make to a size; bring to a suitable size
a large magnitude; "he blanched when he saw the size of the bill"; "the only city of any size in that area"
the physical magnitude of something (how big it is); "a wolf is about the size of a large dog"
the property resulting from being one of a series of graduated measurements (as of clothing); "he wears a size 13 shoe"
(used in combination) sized; "the economy-size package"; "average-size house"
cover or stiffen or glaze a porous material with size or sizing (a glutinous substance)
having the surface treated or coated with sizing
having a specified size
a texture like that of wood (同)woodgraining

PrepTutorEJDIC

〈C〉(穀類の)『粒』《+『of』+『名』》 / 〈U〉《集合的に》『穀物』,穀類 / 〈C〉(砂・塩などの)粒《+『of』+『名』》 / 〈C〉《おもに否定文で》『ごく少量』,ほんの少し(の…)《+『of』+『名』》 / 〈C〉グレーン(最小の重量単位で約0.0648グラム;《略》『gr.』,『g.』) / 〈U〉(木・石などの)きめ,はだ,木目(もくめ),石目
〈U〉〈C〉(人や物の)『大きさ』 / 〈U〉大きいこと / 〈U〉数量,規模 / 〈C〉(帽子・靴・シャツなどの)『サイズ』,『寸法』,型 / 〈U〉《話》実情,真相 / …‘を'大きさ(寸法)によって分類する / …‘を'ある寸法に作る
サイズ,どうさ(紙や織物の細孔(こう)をふさぐ材料) / …‘に'サイズを塗る
サイズ(どうさ)を塗ること,のり付け;サイズ剤,のり剤,どうさ

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/10/16 15:09:01」(JST)

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Wentworth grain size chart from United States Geological Survey Open-File Report 2006-1195

Particle size, also called grain size, refers to the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials. This is different from the crystallite size, which is the size of a single crystal inside the particles or grains. A single grain can be composed of several crystals. Granular material can range from very small colloidal particles, through clay, silt, sand, and gravel, to boulders.

Krumbein Phi Scale-United States[edit]

Size ranges define limits of classes that are given names in the Wentworth scale (or Udden-Wentworth) used in the United States. The Krumbein phi (φ) scale, a modification of the Wentworth scale created by W. C. Krumbein^[1] in 1937, is a logarithmic scale computed by the equation

where

is the Krumbein phi scale,

is the diameter of the particle, and

is a reference diameter, equal to 1 mm (to make the equation dimensionally consistent).

This equation can be rearranged to find diameter using φ:

φ scale	Size range (metric)	Size range (approx. inches)	Aggregate name (Wentworth Class)	Other names
−8 <	256 mm <	10.1 in <	Boulder
−6 to −8	64–256 mm	2.5–10.1 in	Cobble
−5 to −6	32–64 mm	1.26–2.5 in	Very coarse gravel	Pebble
−4 to −5	16–32 mm	0.63–1.26 in	Coarse gravel	Pebble
−3 to −4	8–16 mm	0.31–0.63 in	Medium gravel	Pebble
−2 to −3	4–8 mm	0.157–0.31 in	Fine gravel	Pebble
−1 to −2	2–4 mm	0.079–0.157 in	Very fine gravel	Granule
0 to −1	1–2 mm	0.039–0.079 in	Very coarse sand
1 to 0	½–1 mm	0.020–0.039 in	Coarse sand
2 to 1	¼–½ mm	0.010–0.020 in	Medium sand
3 to 2	125–250 µm	0.0049–0.010 in	Fine sand
4 to 3	62.5–125 µm	0.0025–0.0049 in	Very fine sand
8 to 4	3.90625–62.5 µm	0.00015–0.0025 in	Silt	Mud
> 8	< 3.90625 µm	< 0.00015 in	Clay	Mud
> 10	< 1 µm	< 0.000039 in	Colloid	Mud

In some schemes, gravel is anything larger than sand (comprising granule, pebble, cobble, and boulder in the table above).

International scale[edit]

ISO 14688-1, establishes the basic principles for the identification and classification of soils on the basis of those material and mass characteristics most commonly used for soils for engineering purposes. ISO 14688-1 is applicable to natural soils in situ, similar man-made materials in situ and soils redeposited by man.^[2]

ISO 14688-1^[3]
name			size range
Very coarse soil		Large boulder, LBo	>630 mm
		Boulder, Bo	200 – 630 mm
		Cobble, Co	63 – 200 mm
Coarse soil	Gravel	Coarse gravel, CGr	20 – 63 mm
		Medium gravel, MGr	6.3 – 20 mm
		Fine gravel, FGr	2.0 - 6.3 mm
	Sand	Coarse sand, CSa	0.63 - 2.0 mm
		Medium sand, MSa	0.2 - 0.63 mm
		Fine sand, FSa	0.063 - 0.2 mm
Fine soil	Silt	Coarse silt, CSi	0.02 - 0.063 mm
		Medium silt, MSi	0.0063 - 0.02 mm
		Fine silt, FSi	0.002 - 0.0063 mm
	Clay, Cl		≤0.002 mm

References[edit]

^ http://archives.datapages.com/data/sepm/journals/v01-32/data/007/007001/pdfs/0003.pdf
^ iso.org
^ ISO 14688-1:2002 at scribd.com

External links[edit]

R D Dean & R A Dalrymple, Coastal Processes with Engineering Applications (Cambridge University Press, 2002)
W C Krumbein & L L Sloss, Stratigraphy and Sedimentation, 2nd edition (Freeman, San Francisco, 1963).
J A Udden, "Mechanical composition of clastic sediments", Bull. Geol. Soc. Am. 25, 655-744 (1914).
C K Wentworth, "A scale of grade and class terms for clastic sediments", J. Geology V. 30, 377-392 (1922).

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