Conversion from 100 Cubic centimeters per hour to Cubic millimeters per minute

Information about the Cubic centimeter per hour (cm³/h)

The cubic centimetre per hour is a unit of volumetric flow rate equal to one cubic centimetre passing a point every hour. Its symbol is cm³/h, and because a cubic centimetre is a millilitre, mL/h means the same rate. It describes flows slow enough that nothing appears to move, yet fast enough to matter over a shift or a night.

Hospital infusion is its most common setting. A syringe driver or volumetric pump is programmed in millilitres per hour: maintenance fluid at 80 to 120 for an adult, a sedative at 5, a neonatal feed at less than 1. The nurse setting the pump and the pharmacist calculating the dose both work in this unit, and the dose in milligrams per hour follows from it and the concentration of the bag.

Leak testing uses the unit as a pass-or-fail criterion. A hydraulic fitting, a fuel connector or a refrigeration joint is given an allowable leakage of so many cubic centimetres per hour, measured by collecting what escapes over a long period rather than by watching for a drip. Regulations on refrigerant loss and on vehicle fuel-system emissions are written this way.

Lubrication systems are rated here as well. A centralised oil-drip system on a machine tool delivers a few cubic centimetres per hour to each bearing, and an air-line oiler set correctly gives one drop every few minutes. Too much and the oil contaminates the workpiece; too little and the bearing fails, which is why the rate is specified rather than left to judgement.

Evaporation and drying processes are quantified in the same terms. A solvent evaporating from an open dish, water lost from a laboratory culture, or condensate produced by a small dehumidifier are all naturally described per hour, because the observation period is an hour or a day rather than a second.

The relation to bigger units keeps the scale clear. A thousand cubic centimetres per hour is a litre per hour, and a full day at one cubic centimetre per hour yields 24 cubic centimetres — about a tablespoon and a half. That is the honest measure of what a slow flow accomplishes while nobody is watching.

One cubic centimetre per hour equals one millilitre per hour, about 0.01667 cubic centimetres per minute, or 0.001 litres per hour.

Information about the Cubic millimeter per minute (mm³/min)

The cubic millimetre per minute is a unit of volumetric flow rate equal to one cubic millimetre passing a point every minute. Its symbol is mm³/min. It measures flows so slight that a whole minute yields a volume the size of a coarse grain of salt, and it exists because a great deal of precision engineering happens at exactly that pace.

Electrical-discharge machining is the classic user. A wire eroder cutting hardened tool steel removes 20 to 100 cubic millimetres per minute, and a sinker eroder finishing a mould cavity may remove less than one. The rate is the whole economics of the process: a die that takes eight hours to cut cannot be quoted like one that takes eight minutes, and the removal rate is what separates them.

Grinding and honing are described the same way when the tolerance is tight. A creep-feed grinder roughing a turbine blade root runs at hundreds of cubic millimetres per minute per millimetre of wheel width, but a final spark-out pass approaches zero by design, because the last few micrometres must come off without heating the workpiece.

Adhesive and solder-paste dispensing lives here too. A dot of adhesive on a circuit board is a fraction of a cubic millimetre, and a dispensing valve laying a bead is programmed by rate so the bead stays the same width as the head speeds up and slows down around corners. Underfill, conformal coating and potting are all specified in this unit or its microlitre twin.

Biology and medicine borrow it for slow perfusion. Organ-on-a-chip devices, microdialysis probes and slow-release implants move fluid at single-digit cubic millimetres per minute, and cerebrospinal-fluid production in an adult is about 350 to 500 millilitres a day, which is roughly 250 to 350 cubic millimetres per minute — a useful reminder that the body itself works at this scale.

Sixty cubic millimetres per minute is one cubic millimetre per second, and a million is one litre. Put together, that means a flow of one cubic millimetre per minute would need almost two years to fill a one-litre bottle.

One cubic millimetre per minute equals 0.001 millilitres per minute, about 0.01667 cubic millimetres per second, or one microlitre per minute.