What is the shortest and longest unit of time, what is the unit of the smallest time

With the rapid development of science and technology, people's research on the macro and micro world continues to deepen, which objectively increases the requirements for measurement units. In terms of time, the second is far from the shortest unit of time, and the longest unit of time in years is long outdated.

Currently, the shortest unit of time in the world is called the nanosecond. This unit began to be officially used in 1960. We usually feel that a second is a short time, but a "nano second" is actually equal to a second.

In one second, light can travel nearly 300,000 kilometers, but in a "nano second", it travels only about 30 centimeters. This shows how small the unit of "nano second" is.

The Hindu chronological unit "kalpa" is the longest unit of time in the world. One "kalba" is equal to about 100 million years. In astronomy, people call the time it takes for the sun to revolve around the Milky Way as a cosmic year, which is about 100 million years, which is a frighteningly large number.

But in a "kalba", the sun is centered on the Milky Way and can circle more than 19 times. That is, a cosmic year is only one-nineteenth of a "kalba".

The longest unit of measurement for time should be "century"; The minimum time measurement unit should be "seconds".

The largest unit of time is the galactic year (GY), also known as the cosmic year, which is the amount of time it takes for the solar system to make one revolution around the center of the Milky Way in orbit, estimated to be between 100 million and 100 million "Earth years".

The smallest unit of time is Planck time, which is about 10 seconds minus 43 seconds, which is the shortest time that can be observed theoretically.

Time unit: A millennium is a span of time spanning a thousand years. In the Gregorian calendar, a year is called a millennium (or the year after that year) if it is divisible by 1000, such as 2000 or 2001 can be considered a new millennium.

A century is a hundred years and usually refers to a continuous hundred years. When used to calculate days, the century usually begins with an era divisible by 100 or a year thereafter, such as 2000 or 2001.

A year is a unit of time between the recurrence of an event related to the Earth's orbit around the Sun. Generally speaking, the length of the year is the time interval that the Sun travels on the celestial sphere along the ecliptic from a certain punctuation point back to the same punctuation point.

Units of time shorter than seconds:

1. Milliseconds. A millisecond is a tiny unit of time, one thousandth of a second (second), or ms for short. The shortest** time for a typical camera is one millisecond.

A housefly flappes its wings every three milliseconds; Mosquitoes flap their wings once in twenty milliseconds; Bees fan every five milliseconds. Due to the gradual widening of the moon's orbit around the Earth, the time it takes to make one revolution is two milliseconds longer per year. In computer science, an interval of 10 milliseconds is called a jiffy.

2. Microseconds. Microsecond is one millionth of a second (minus 6 seconds of 10), abbreviated as s. Light can travel 300 meters in this time, which is about the length of 3 football fields, but sound waves at sea level can only travel 1 3 mm.

High-speed commercial stroboscopes flash once for about 1 microsecond. A barrel of explosives begins approximately 24 microseconds after its fuse burns out**.

3. Nanoseconds. Nanosecond is one billionth of a second (minus 9 seconds of 10), abbreviated as ns. It is often used as a unit of memory read and write speed.

Light travels only 30 centimeters (less than one step) in a nanosecond in a vacuum. A PC's microprocessor takes about 2 to 4 nanoseconds to execute an instruction, such as adding two numbers. Another rare subatomic particle, the k-meson, exists for 12 nanoseconds.

You can take a breath, you can take a look, you can hug your parents, you can write a word, you can close your eyes, you can yawn, you can pick up something, you can take a step, you can run 10 meters, you can turn around.

The unit of time, the second (second), is the basic unit of time in the International System of Units and the symbol is s. Sometimes the abbreviation is used to mark it as sec.

The day is divided into 24 equal portions, and each portion is still represented by "hour". At this time, "one hour" is one hour now, which is only half of the "one hour" or "one hour" in the past (after the Han Dynasty), and the time referred to is shortened.

Then, the hour is divided into 60 equal parts, and the time of each part is called 1 minute, and the time of 1 minute is divided into 60 equal parts, and the time of each part is called 1 second. In this way, the hours, minutes, and seconds are determined.