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Miles Per Day to Millimeters Per Second
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Convert Millimeters Per Second to Miles Per Day (mm/s to mi/day) ▶

Conversion Table

miles per day to millimeters per second
mi/day	mm/s
1 mi/day	18.6267 mm/s
2 mi/day	37.2533 mm/s
3 mi/day	55.88 mm/s
4 mi/day	74.5067 mm/s
5 mi/day	93.1333 mm/s
6 mi/day	111.76 mm/s
7 mi/day	130.3867 mm/s
8 mi/day	149.0133 mm/s
9 mi/day	167.64 mm/s
10 mi/day	186.2667 mm/s
11 mi/day	204.8933 mm/s
12 mi/day	223.52 mm/s
13 mi/day	242.1467 mm/s
14 mi/day	260.7733 mm/s
15 mi/day	279.4 mm/s
16 mi/day	298.0267 mm/s
17 mi/day	316.6533 mm/s
18 mi/day	335.28 mm/s
19 mi/day	353.9067 mm/s
20 mi/day	372.5333 mm/s

How to convert

1 mile per day (mi/day) = 18.62666667 millimeter per second (mm/s). Mile Per Day (mi/day) is a unit of Speed used in Standard system. Millimeter Per Second (mm/s) is a unit of Speed used in Metric system.

Miles Per Day

Definition of Miles Per Day

Miles per day (mi/d) is a unit of speed that measures how fast something is moving in terms of miles per unit of time. It is commonly used in the United States, the United Kingdom, and some other countries that use the US Standard system of measurement or have close historical ties with them. It is often used for measuring the average speed or distance traveled by an object or phenomenon over a period of time that is measured in days or longer.

One mile per day is equal to 0.0416666667 miles per hour, or 0.0185185185 meters per second. It can also be converted to other units of speed, such as kilometers per hour, feet per second, or knots, by using appropriate conversion factors.

How to Convert Miles Per Day

To convert miles per day to other units of speed, we need to multiply or divide by the corresponding conversion factors. For example, to convert miles per day to kilometers per hour, we need to multiply by 1.609344, since there are 1.609344 kilometers in one mile. To convert miles per day to meters per second, we need to multiply by 0.018518518518519, since there are 0.018518518518519 meters in one mile.

Here are some examples of how to convert miles per day to other units of length in the US Standard system and the SI system:

To convert 10 mi/d to kilometers per hour (km/h), we multiply by 1.609344: 10 mi/d x 1.609344 = 16.09344 km/h
To convert 20 mi/d to feet per second (fps), we multiply by 0.05787037037037, since there are 0.05787037037037 feet in one meter: 20 mi/d x 0.05787037037037 = 1.157407407407 fps
To convert 30 mi/d to knots (kn), we multiply by 0.03626111111, since there are 0.0362611111 nautical miles in one mile: 30 mi/d x 0.0362611111 = 1.08783333 kn
To convert 40 mi/d to meters per second (m/s), we multiply by 0.018518518518519: 40 mi/d x 0.018518518518519 = 0.740740740741 m/s
To convert 50 mi/d to meters per minute (m/min), we multiply by 1.11111, since there are 1.11111 minutes in one hour: 50 mi/d x 1.11111 = 55.555555556 m/min
To convert 60 mi/d to centimeters per second (cm/s), we multiply by 100, since there are 100 centimeters in one meter, and multiply by 0.018518518518519: 60 mi/d x 100 x 0.018518518518519 = 111.11111 cm/s

Where Miles Per Day Are Used

Miles per day are mainly used for measuring the average speed or distance traveled by an object or phenomenon over a period of time that is measured in days or longer. They are often used in fields such as travel, fitness, sports, and geography, where the speed or distance traveled by an object or phenomenon is measured in terms of miles per unit of time.

For example, a person may travel an average of 100 mi/d on a road trip across a country, which means that they cover an average distance of 100 miles in one day. A runner may run an average of 5 mi/d as part of their training routine, which means that they run a distance of 5 miles in one day. A planet may have an orbital velocity of thousands of miles per day, which means that it covers thousands of miles along its orbit in one day.

Miles per day are also used in some other fields where the speed or distance traveled by an object or phenomenon is measured in terms of miles per unit of time.

History of Miles Per Day

The origin of miles per day as a unit of speed can be traced back to the development of the US Standard system and the mile as a unit of length in the late eighteenth century. The mile was defined as one thousand six hundred and nine meters (or eight furlongs) based on the English statute mile.

The term mile first appeared in English in the late fourteenth century, but it was not until later in the early nineteenth century that the use of miles per day became more common; before that, other units such as miles per hour or leagues per day were preferred for expressing speed.

Miles per day have been used ever since as a standard unit of speed for measuring the average speed or distance traveled by an object or phenomenon over a period of time that is measured in days or longer. They have also been adopted by some international organizations and conventions, such as the International System of Units and the International Astronomical Union.

Example Conversions of Miles Per Day to Other Units

Here are some examples of how to convert miles per day to other units of speed, using the conversion factors given above:

To convert 100 mi/d to kilometers per hour, we multiply by 1.609344: 100 mi/d x 1.609344 = 160.9344 km/h
To convert 200 mi/d to feet per second, we multiply by 0.05787037037037: 200 mi/d x 0.05787037037037 = 11.574074074074 fps
To convert 300 mi/d to knots, we multiply by 0.0362611111: 300 mi/d x 0.0362611111 = 10.8783333 kn
To convert 400 mi/d to meters per second, we multiply by 0.018518518518519: 400 mi/d x 0.018518518518519 = 7.407407407407 m/s
To convert 500 mi/d to meters per minute, we multiply by 1.11111: 500 mi/d x 1.11111 = 555.55556 m/min
To convert 600 mi/d to centimeters per second, we multiply by 100 and multiply by 0.018518518518519: 600 mi/d x 100 x 0.018518518518519 = 1111.1111 cm/s
To convert 700 mi/d to millimeters per minute, we multiply by 1000, since there are 1000 millimeters in one meter, and multiply by 1.11111: 700 mi/d x 1000 x 1.11111 = 777777.77778 mm/min

Miles per day also can be marked as mile/day.

How to convert millimeters per second

Millimeters 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:

Meters per second (m/s): To convert from mm/s to m/s, divide by 1000. To convert from m/s to mm/s, multiply by 1000. For example, 1 mm/s is equal to 0.001 m/s, and 10 m/s is equal to 10000 mm/s.
Kilometers per hour (km/h): To convert from mm/s to km/h, multiply by 0.0036. To convert from km/h to mm/s, divide by 0.0036. For example, 1 mm/s is equal to 0.0036 km/h, and 50 km/h is equal to 13888.89 mm/s.
Miles per hour (mph): To convert from mm/s to mph, multiply by 0.00223694. To convert from mph to mm/s, divide by 0.00223694. For example, 1 mm/s is equal to 0.00223694 mph, and 30 mph is equal to 13411.2 mm/s.
Knots (kn): To convert from mm/s to kn, multiply by 0.00194384. To convert from kn to mm/s, divide by 0.00194384. For example, 1 mm/s is equal to 0.00194384 kn, and 15 kn is equal to 7716.12 mm/s.
Feet per second (ft/s): To convert from mm/s to ft/s, multiply by 0.00328084. To convert from ft/s to mm/s, divide by 0.00328084. For example, 1 mm/s is equal to 0.00328084 ft/s, and 40 ft/s is equal to 12192 mm/s.
Inches per second (in/s): To convert from mm/s to in/s, multiply by 0.0393701. To convert from in/s to mm/s, divide by 0.0393701. For example, 1 mm/s is equal to 0.0393701 in/s, and 20 in/s is equal to 508 mm/s.

Where millimeters per second are used

Millimeters 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 10-20 micrometers per second, which is equivalent to 0.01-0.02 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 second

According 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 second

The 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 eighty-six 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 units

Here are some examples of converting millimeters per second to other units of speed or velocity:

1 mm/s = 0.001 m/s = 0.0036 km/h = 0.00223694 mph = 0.00194384 kn = 0.00328084 ft/s = 0.0393701 in/s
2 mm/s = 0.002 m/s = 0.0072 km/h = 0.00447388 mph = 0.00388768 kn = 0.00656168 ft/s = 0.0787402 in/s
5 mm/s = 0.005 m/s = 0.018 km/h = 0.0111847 mph = 0.0097192 kn = 0.0164042 ft/s = 0.196851 in/s
10 mm/s = 0.01 m/s = 0.036 km/h = 0.0223694 mph = 0.0194384 kn = 0.0328084 ft/s = 0.393701 in/s
20 mm/s = 0.02 m/s = 0.072 km/h = 0.0447388 mph = 0.0388768 kn = 0.0656168 ft/s = 0.787402 in/s
50 mm/s = 0.05 m/s = 0.18 km/h = 0.111847 mph = 0.097192 kn = 0.164042 ft/s = 1.9685 in/s
100 mm/s = 0.1 m/s = 0.36 km/h = 0.223694 mph = 0.194384 kn = 0.328084 ft/s = 3.93701 in/s

Millimeters per second also can be marked as mm/s and Millimetres per second (alternative British English spelling in UK).

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Miles Per Day to Millimeters Per Second Converter