pH scale
Escala de pH
- Date
- 1909 · confidence high
- Place
- Carlsberg Laboratory, Copenhagen, Denmark
- Credited to
- Søren Sørensen
- People
- 👤 Søren Sørensen1897–1965
- Field
- Matter & energy
What was discovered
Sørensen defines pH as the negative logarithm of the hydrogen ion concentration to control enzyme activity in brewing. It turns acidity into a measurable, universal quantity.
Redefined in 1924 in terms of activity.
What it led to
- Enzyme biochemistry
- Industrial and agricultural quality control
- Glass electrode pH meter (Beckman, 1934)
Built on
Made possible
- pH meter
- buffer solutions