Previous Page...   Printer Version Science Constants - Constant, First Radiation 2πhc2 Symbol: c1 Value: 3.74177107(29) × 10-16 W m2 Category: - Physico-Chemical Constants Description:   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] [ Download ] [ Shop ] [ Contact ] [ About ]