Raindrop Size, Shape, Volume and Mass Web Calculator

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Raindrop Size, Shape, Volume and Mass Calculator and Plot

The equivalent diameter a
rain drop would have if it was perfectly spherical.

Air Temperature (T) =

°C

Temperature of the rain
water droplet. Usually local air temperature will be close enough for
sustained rain events.

Raindrop
Weight (Mass) =

grams

Black line = rain drop shape, Gray line = perfect
circle (equivalent spherical rain drop shape)

Spherical
Raindrop Radius (Req) =

mm

[No canvas support]

Rain
drop volume =

mm^3

Density
of air-saturated rain water@ T (°C) =

kg/m3

Density
of air-saturated rain water @ T (°C) =

g/mm3

Density
of pure air-free rain water @ T (°C) =

kg/m3

Raindrops Ø1.5mm to
Ø6 mm in equivalent diameter

Raindrop Diameter (Deq) =

mm

Equation
Coefficient c1 =

Equation
Coefficient c2 =

Equation
Coefficient c3 =

Equation
Coefficient c4 =

c4_Deq>4mm
=

c4_1.5<Deq<4mm
=

0.000000

Ellipse
Axis Ratio for Raindrops below Ø1.5 mm

Axis ratio b/a ( < 1.5 mm)
=

ratio

Ellipse axis a =

mm

Ellipse axis b =

mm

Ellipse Axis Ratio for Raindrops Ø0.7 mm to
Ø1.5 mm

b/a (0.7 ≤ Deq ≤ 1.5 mm) =

ratio

Ellipse Axis Ratio for Raindrops below Ø0.7
mm

b/a (Deq < 0.7 mm) =

1

ratio

Real Raindrop Shape and Size 1.5mm to 6 mm

Equivalent Spherical Raindrop Diameter

Real Raindrop smaller than 1.5mm

point
distribution o plot

X (mm)

Y (mm)

Drop shape symmetry

Angle (deg)

circle X (mm)

circle Y (mm)

circle symmetry

ellipse X (mm)

ellipse Y (mm)

ellipse symmetry

0

0.0

0.005

0.01

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

180.0

REFERENCES:

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

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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