微米单位大小介绍
微米转化表 颗粒尺寸大小对比图
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提示：1、人的肉眼可辨的颗粒大尺寸40μm
2、对系统产生较大危害的颗粒尺寸为15μm
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|
US和ASTM 标准目数 |
实际开度大小 （in） |
(μm) |
| 10 | 0.0787 | 2000 |
| 12 | 0.0661 | 1680 |
| 14 | 0.0555 | 1410 |
| 16 | 0.0469 | 1190 |
| 18 | 0.0394 | 1000 |
| 20 | 0.0331 | 840 |
| 25 | 0.0280 | 710 |
| 30 | 0.0232 | 590 |
| 35 | 0.0197 | 500 |
| 40 | 0.0165 | 420 |
| 45 | 0.0138 | 350 |
| 50 | 0.0117 | 297 |
| 60 | 0.0098 | 250 |
| 70 | 0.0083 | 210 |
| 80 | 0.0070 | 177 |
| 100 | 0.0059 | 149 |
| 120 | 0.0049 | 125 |
| 140 | 0.0041 | 105 |
| 170 | 0.0035 | 88 |
| 200 | 0.0029 | 74 |
| 230 | 0.0024 | 62 |
| 270 | 0.0021 | 53 |
| 325 | 0.0017 | 44 |
| 400 | 0.00142 | 36 |
| 550 | 0.00099 | 25 |
| 625 | 0.00079 | 20 |
| 1,250 | 0.000394 | 10 |
| 1,750 | 0.000315 | 8 |
| 2,500 | 0.00097 | 5 |
| 5,000 | 0.000099 | 2.5 |
| 12,000 | 0.0000394 | 1 |
Linear Equivalents
1in = 25.4 mm = 25,400 μm
1mm = 0.0394 in = 1,000 μm
1μm = 1/25,400 in = 0.001 mm
1μm = 3.94 x 10.5 in = 0.000039 in
Formulas
Velocity (ft per sec) =0.4085 x gpm/d2(ID in)
Conversion Rates
1 cu ft = 7.48 gal
1 gal = 231 cu in
2 cu ft water = 62.42 lb
1 gal water = 8.34 lb
1 US gal = 0.833 lmp gal
1 lb/in2 = 2.31 ft of wat = 2.036 in Hg
oF = 9/5oC+32
Metric Conversion Formulas
mm = inches x 25.4 m = feet x 0.3048 cm3 = cu in x 16.39 m3 = cu ft x 0.028
kg = pounds x 0.454 kPa = psi x 6.895 pm = gpm x 3.785 oC = 5/9 (oF-32)
微米比较Formulas
Velocity (ft per sec) =0.4085 x gpm/d2(ID in)
Conversion Rates
1 cu ft = 7.48 gal
1 gal = 231 cu in
2 cu ft water = 62.42 lb
1 gal water = 8.34 lb
1 US gal = 0.833 lmp gal
1 lb/in2 = 2.31 ft of wat = 2.036 in Hg
oF = 9/5oC+32
Metric Conversion Formulas
mm = inches x 25.4 m = feet x 0.3048 cm3 = cu in x 16.39 m3 = cu ft x 0.028
kg = pounds x 0.454 kPa = psi x 6.895 pm = gpm x 3.785 oC = 5/9 (oF-32)
| 物质 | (μm) |
| 食用盐 | 100 |
| 人的头发（平均直径） | 50-70 |
| 白细胞 | 25 |
| 滑石粉 | 10 |
| 可可粉 | 8-10 |
| 红细胞 | 8 |
| 细胞（微生物球菌） | 2 |
提示：1、人的肉眼可辨的颗粒大尺寸40μm
2、对系统产生较大危害的颗粒尺寸为15μm
