How to type answers requiring Units.

Use a single SPACE to separate the Number from the Unit.
There must be no other SPACES anywhere else in the answer string.
 Use the symbols * / ^ to form compound units. The usual rules of commutation and association apply.

 Note: Units are case-sensitive. e.g. milliliter is mL , not ml.

Examples of correct entries.

The length of a rod is 167.2 centimeters:
 1.672 m 167.2 cm 1672 mm 1.672E+3 mm 1.672E-3 km 1.672E+9 nm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The density of a substance is 6.53 grams per milliliter:
 6.53 g/mL 6.53 g*mL^-1 6.53 g/cm^3 6.53 kg/L 6530 kg/m^3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The pressure of a gas is 0.987 atmosphere:
 0.987 atm 750. torr 100. kPa 1.00 bar 1.00E5 kg*m^-1*s^-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The specific heat of water is 4.18 Joules per gram per Kelvin:
 4.18 J/g/K 4.18 J/K/g 4.18 J/(g*K) 4.18 J*(K*g)^-1 4.18 J*g^-1*K^-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Units are not required for every question. Read the questions carefully.

Examples:

Question: What is the mass of 1.0 mol of O2? Answer: 32 g
Question: How many grams of O2 are there in 1.0 mol? Answer: 32

Please note that if you fail to enter units, when required, you will not be discounted a try, but will receive the warning: "Units required".
If you enter incorrectly formatted units or units of the wrong dimensionality, you will again not be discounted a try, but will receive the warning: "Units incorrect".
You may use any SI units of the correct dimensionality (e.g. mass, distance, pressure, volume, energy, temperature etc), and some non-standard units also.

 For example, if the correct answer is 1.002 kg, then 1002 g will also be accepted, whereas 1.002 g will simply be graded "incorrect". If you entered 1002 G, you would get the warning "Units incorrect".