Water

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Water, H₂O is the most abundant compound on Earth's surface.

[edit] Optical properties

Refractive index	1.333 (at 0.5876 µm, 20 °C)

Temperature, °C	Density, g/cm³	C_p, J/(g·K)	Vapour pressure, kPa	Viscosity, μPa·s	Thermal conductivity, mW/(m·K)	Dielectric constant	Surface Tension, mN/m
0	0.99984	4.2176	0.6113	1793	561.0	87.90	75.64
10	0.99970	4.1921	1.2281	1307	580.0	83.96	74.23
20	0.99821	4.1818	2.3388	1002	598.4	80.20	72.75
30	0.99565	4.1784	4.2455	797.7	615.4	76.60	71.20
40	0.99222	4.1785	7.3814	653.2	630.5	73.17	69.60
50	0.98803	4.1806	12.344	547.0	643.5	69.88	67.94
60	0.98320	4.1843	19.932	466.5	654.3	66.73	66.24
70	0.97778	4.1895	31.176	404.0	663.1	63.73	64.47
80	0.97182	4.1963	47.373	354.4	670.0	60.86	62.67
90	0.96535	4.2050	70.117	314.5	675.3	58.12	60.82
100	0.95840	4.2159	101.325	281.8	679.1	55.51	58.91

(from ^[1] with corrections)