

Convert Millimeters Per Second to Kilometers Per Second (mm/s to km/s) ▶ Conversion Table
How to convert1 kilometer per second (km/s) = 1000000 millimeter per second (mm/s). Kilometer Per Second (km/s) is a unit of Speed used in Metric system. Millimeter Per Second (mm/s) is a unit of Speed used in Metric system. Kilometers per second: A unit of speedKilometers per second (km/s) is a unit of speed or velocity in the International System of Units (SI). It measures how fast an object is moving by calculating the distance traveled in kilometers divided by the time taken in seconds. For example, if a rocket travels 10 kilometers in 5 seconds, its speed is 2 km/s. How to convert kilometers per secondKilometers per second can be converted to other units of speed or velocity by using simple conversion factors. Here are some common units and their conversion factors:
Where kilometers per second are usedKilometers per second are mainly used in astronomy and space science to measure the speed or velocity of celestial bodies and spacecrafts. For example, the Earth orbits the Sun at an average speed of about 30 km/s. The Moon orbits the Earth at an average speed of about 1 km/s. The International Space Station orbits the Earth at an average speed of about 7.66 km/s. The Voyager 1 spacecraft, which is the farthest humanmade object from Earth, travels at a speed of about 17 km/s. The speed of light in a vacuum is about 300000 km/s. Definition of kilometers per secondAccording to the SI definition, one kilometer per second is the speed of a body that covers a distance of one kilometer in a time of one second. Mathematically, it can be expressed as:
where v is the speed or velocity in kilometers per second, s is the distance traveled in kilometers, and t is the time taken in seconds. History of kilometers per secondThe concept of speed or velocity has been studied since ancient times by philosophers and scientists such as Aristotle, Galileo, Newton, etc. The kilometer was originally defined in 1793 by the French Academy of Sciences as one tenmillionth of the distance from the equator to the North Pole along a meridian through Paris. The second was originally defined in terms of the Earth’s rotation as one eightysix thousand four hundredth of a mean solar day. The combination of these two units resulted in the kilometer per second as a unit of speed or velocity. The kilometer per second was officially adopted as part of the SI system in 1960. Example conversions of kilometers per second to other unitsHere are some examples of converting kilometers per second to other units of speed or velocity:
How to convert millimeters per secondMillimeters per second can be converted to other units of speed or velocity by using simple conversion factors. Here are some common units and their conversion factors:
Where millimeters per second are usedMillimeters per second are mainly used in microbiology and nanotechnology to measure the speed or velocity of microscopic organisms and processes. For example, the average speed of a bacterium such as Escherichia coli is about 1020 micrometers per second, which is equivalent to 0.010.02 mm/s. The average speed of a virus such as influenza A virus is about 1 micrometer per second, which is equivalent to 0.001 mm/s. The average speed of a nanorobot such as a DNA origami walker is about 4 nanometers per second, which is equivalent to 0.000004 mm/s. Definition of millimeters per secondAccording to the SI definition, one millimeter per second is the speed of a body that covers a distance of one millimeter in a time of one second. Mathematically, it can be expressed as:
where v is the speed or velocity in millimeters per second, s is the distance traveled in millimeters, and t is the time taken in seconds. History of millimeters per secondThe concept of speed or velocity has been studied since ancient times by philosophers and scientists such as Aristotle, Galileo, Newton, etc. The millimeter was originally derived from the meter in the late 18th century as one thousandth of a meter. The second was originally defined in terms of the Earth’s rotation as one eightysix thousand four hundredth of a mean solar day. The combination of these two units resulted in the millimeter per second as a unit of speed or velocity. The millimeter per second was officially adopted as part of the SI system in 1960. Example conversions of millimeters per second to other unitsHere are some examples of converting millimeters per second to other units of speed or velocity:
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