Charles Edouard Guillaume 1861 - 1938
- occupation:
- Metrologist, Physicist
- Nationality:
- Swiss/French
- born in:
- Fleurier, Neuchâtel, Switzerland
Known for his discovery of nickel-steel alloys he named invar and elinvar. Invar has a near-zero coefficient of thermal expansion. He was the first to determine the correct temperature of space.
