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Raindrop Size, Shape, Volume and Mass Calculator and Plot
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Copyright © BARANI DESIGN Technologies
s.r.o. a
manufacturer of professional rain gauges and wireless rain gauges including
IoT micro weather stations and professional weather sensors which meet all
precision and accuracy requirements of the WMO and NWS for professional
climate monitoring.
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Ø Raindrop Diameter (Deq) =
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mm
(1.5 ≤ Deq ≤ 6 mm)
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The equivalent diameter a
rain drop would have if it was perfectly spherical.
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Air Temperature (T) =
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°C
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Temperature of the rain
water droplet. Usually local air temperature will be close enough for
sustained rain events.
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Raindrop
Weight (Mass) =
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grams
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Black line = rain drop shape, Gray line = perfect
circle (equivalent spherical rain drop shape)
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Spherical
Raindrop Radius (Req) =
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mm
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Rain
drop volume =
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mm^3
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Density
of air-saturated rain water @ T (°C) =
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kg/m3
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Density
of air-saturated rain water @ T (°C) =
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g/mm3
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Density
of pure air-free rain water @ T (°C) =
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kg/m3
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Raindrops Ø1.5mm to
Ø6 mm in equivalent diameter
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Raindrop Diameter (Deq) =
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mm
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Equation
Coefficient c1 =
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Equation
Coefficient c2 =
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Equation
Coefficient c3 =
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Equation
Coefficient c4 =
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c4_Deq>4mm
=
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c4_1.5<Deq<4mm
=
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0.000000
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Ellipse
Axis Ratio for Raindrops below Ø1.5 mm
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Axis ratio b/a ( < 1.5 mm)
=
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ratio
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Ellipse axis a =
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mm
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Ellipse axis b =
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mm
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Ellipse Axis Ratio for Raindrops Ø0.7 mm to
Ø1.5 mm
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b/a (0.7 ≤ Deq ≤ 1.5 mm) =
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ratio
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Ellipse Axis Ratio for Raindrops below Ø0.7
mm
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b/a (Deq < 0.7 mm) =
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1
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ratio
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Real Raindrop Shape and Size 1.5mm to 6 mm
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Equivalent Spherical Raindrop Diameter
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Real Raindrop smaller than 1.5mm
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point
distribution o plot
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X (mm)
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Y (mm)
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Drop shape symmetry
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Angle (deg)
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circle X (mm)
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circle Y (mm)
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circle symmetry
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ellipse X (mm)
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ellipse Y (mm)
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ellipse symmetry
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0
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0.0
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0.005
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0.01
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0.1
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0.2
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0.3
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0.4
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0.5
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0.6
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0.7
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0.8
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0.9
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1
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180.0
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REFERENCES:
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DROP SHAPE AND ORIENTATION ANGLE DISTRIBUTIONS IN RAIN FROM 2-D
VIDEO DISDROMETER
G.J. Huang1, V. N. Bringi1*, M. Schönhuber2, M. Thurai1, T. Shimomai3, T.
Kozu3, Marzuki4 and W. Harjupa5
1 Colorado State University, Fort Collins, Colorado, USA; 2 Joanneum
Research, Graz, Austria; 3 Shimane University, Matsue, Japan; 4 Andalas
University, Padang, Indonesia; 5 LAPAN, Bukittingi, Indonesia
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ITS-90 Density of Water Formulation for Volumetric Standards
Calibration
Frank E. Jones, 32 Orchard Way South, Potomac, MD 20854
Georgia L. Harris, National Institute of Standards and Technology,
Gaithersburg, MD 20899
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