(m) The SI base unit of distance.
Definition: 1983 defined as the distance traveled by light in a vacuum during the time interval of 1/299 792 458 of a second.
The speed of light in a vacuum, c, is one of the fundamental constants of nature.

1 meter (m) is equal to approximately 39.370 079 inches (in)
1 meter is equal to approximately 3.280 840 feet (ft)
1 meter is equal to approximately 1.093 613 3 yard (yd)
1 square meter (m²) is equal to approximately 10.763911 square feet (ft²)
1 inch = 2.54 centimeters
Smaller or larger units are, e.g.:
1 (m) = 1 000 millimeter (mm)
1 kilometer (km) = 1 000 (m)
1 kilometer (km) = 0.62137 (statute) miles (mi)

See also system international.

A flowmeter is a device to measure velocity or volume of flow of liquids or gases passing a given point per unit of time.

See also Time of Flight.

From POINT Biomedical Corp
M1091 is a nitrogen-filled submicron ultrasound contrast agent with a bilayered shell composed of a biodegradable polymer and a human serum albumin outer coating. This agent under development consists of microbubbles that have a peak volumetric diameter of 0.57 μm, and a mean initial diameter of 800 nm, with more than 93% having a diameter smaller than 1 μm. Manipulations in the manufacturing process can generate structures varying in size and wall thickness.
M1091 and M1134 are two agents made of the same polymer with the same relative wall thickness, differing only in the microbubble diameter.

From Bracco Research S. A., Geneva, Switzerland
BG1135 is a polymer-shelled new ultrasound contrast agent under development. The air-filled microsphere has a rigid, 100 nm thick polymeric shell and a mean diameter of 2.9 μm with 99% less than 8 μm.
The destruction mechanism of BG1135 is unique among microbubbles. The microbubbles of BG1135 appear to acquire a small shell defect, allowing the filling gas to stream out and creating a new gas bubble, but leaving the old shell intact. No significant differences between the diameters of the shells can be measured before and after insonation even though the agent is fragmented.

From POINT Biomedical Corp
M1134 is a nitrogen-filled submicron ultrasound contrast agent under development with a bilayered shell composed of a biodegradable polymer and a human serum albumin outer coating. The microbubbles have initial diameters from 500 nm to 1.3 μm, with more than 50% having a diameter smaller than a micron.
M1134 can be used in targeted contrast imaging by entering the lymphatic system after injection into the interstitium and accumulation at lymph nodes.
M1134 and M1091 are two agents made of the same polymer with the same relative wall thickness, differing only in the microbubble diameter.