Here are some common unit comparisons:
length
1 kilometer= 1000 meters
1 meter= 100 centimeters
1 mile= 5280 feet
1 foot= 12 inches
mass
1 metric ton=100 kilograms
1 kilogram= 1000 grams
1 gram= 1000 milligrams
1 pound= 16 ounces
volume
1 gallon= 4 quarts
1 quart= 2 pints
1 pint= 2 cups
1 cup= 8 fluid ounces
1 tablespoon= 3 teaspoons
1 liter=1000 milliliters
Ye.. the concentration of a substance is measured as the amount of substance per unit volume. Accordingly, the amount of a substance in per unit volume is the concentration of the substance.
The SI unit is the kilogram per meter (kg/m).
The evaporation rate can be expressed by the amount of water evaporated from a unit surface area per unit of time.
The amount of a substance per defined space. Concentration usually is expressed in terms of mass per unit volume.
The SI unit for pressure (which is what you're describing) is the pascal, which is defined as one newton per square meter (a newton is itself a kilogram - meter per second squared, so in SI base units a pascal is one kilogram per meter per second per second).A pascal is a pretty small amount of pressure. To put it into perspective, normal atmospheric pressure on Earth at sea level is about 100,000 Pa.
Yes, a unit rate is the amount for one single unit. In this case, 'per gallon' indicates for 1 single gallon.
Pressure is equal to the amount of force per unit area.
unit rate
If you mean "per unit area", that is the pressure.
No, the density is defined as the amount of mass per unit volume.
unit price
The amount paid per unit of work produced is typically referred to as the "piece rate."
It is the amount paid per unit when purchased at wholesale.
Pressure is defined as force per unit area.
The amount of substance per unit of volume is defined as concentration in terms of chemistry. The amount of substance refers to the quantity over the volume.
A watt is the amount of work per second.
An electric current is the amount of electrons per unit time or seconds.