Second is base unit of time, used to be based on Earth's rotation. Now based on caesium-133 atom's radiation cycles. Leap seconds added to keep time consistent
MKS system uses metre, kilogram, and second as base units. Distance, mass, and time are measured in these units. Derived units are defined using appropriate combinations
Minute equals 60 seconds in time. One hour contains 60 minutes. SI symbol is min without dot. Prime symbol ′ can also denote minutes informally
Second is SI base unit, defined as 9 billion caesium atom oscillations. Scientific units are multiples of seconds, like nanosecond and millisecond. Jiffy measures light travel time to one femtometre
One hour equals 3,600 seconds. Conversion formula: seconds = hours × 3,600
Calculator converts seconds to years and vice versa. Simple input process returns instant results. Example: 500,000 seconds equals 0.015844 years