April 14th is World Quantum Day - Every day in 2025 is World Quantum Day

The World Quantum Day is celebrated on April 14, a reference to 4.14, the rounded first digits of Planck’s constant: 4.1356677×10−15 eV⋅s = 0.000 000 000 000 004 1356677 electron volt second, a product of energy and time that is the fundamental constant governing quantum physics.

Why is Planck’s constant so important? Did you know it is used to define the kilogram? And, otherwise, how does it affect our lives? These are some of the questions, among many others, that will be addressed by the World Quantum Day activities.

World quantum day is celebrated by quantum scientists around the World since 2022. Are you organising a special event or celebration at your company, school, community? Let us know and submit your event at quantum2025.nz!