Chemistry · Some Basic Concepts Of Chemistry · NEET
Yes. 1 mL = 1 cm³ exactly. They are two names for the same volume. In many books you also see "cc" (cubic centimetre), and 1 cc = 1 cm³ = 1 mL too. So mL, cm³ and cc are all equal. If a question gives 18 mL of water, you can read it as 18 cm³ without any conversion.
1 L = 1 dm³. They are equal. This is because 1 dm = 10 cm, so 1 dm³ = 10 × 10 × 10 = 1000 cm³, and 1 L is also 1000 cm³ (since 1 L = 1000 mL = 1000 cm³). So litre and dm³ are the same size. Remember: 1 L = 1 dm³ = 1000 cm³ = 1000 mL.
They are just different sizes of the same kind of unit (cubic length). 1 dm = 10 cm, so 1 dm³ = 1000 cm³. A dm³ is 1000 times bigger than a cm³. Note it is 1000 (not 10) because volume cubes the length: (10)³ = 1000. So going from cm³ to dm³ you divide by 1000, and from dm³ to cm³ you multiply by 1000.
The true SI unit of volume is the cubic metre (m³), but m³ is far too big for lab work. So chemists use the smaller cm³ and dm³, which are proper SI-derived units. Litre (L) works fine and equals 1 dm³, but litre is not an SI unit. That is why exams often write dm³ instead of L — they mean the same volume.
Divide by 1000. Since 1 L = 1000 cm³, just move the decimal three places left. Example: 250 cm³ = 250 ÷ 1000 = 0.25 L. To go back from litre to cm³, multiply by 1000. Example: 0.5 L = 500 cm³ = 500 mL.
Yes, all three are equal: 1 cc = 1 mL = 1 cm³. "cc" just means "cubic centimetre" written in short form. You see cc on syringes and medicine bottles. In NEET, if you meet cc, treat it exactly like mL or cm³ — no conversion needed.
In which of the following is the number of water molecules maximum?
Try the real previous-year questions from this chapter — each with the answer and a full solution.
The SI unit of volume is the cubic metre (m³). But it is very large for lab use, so chemistry uses smaller SI-derived units cm³ and dm³, and the common (non-SI) unit litre.
No. Litre (L) is a common unit but not an SI unit. It equals 1 dm³. The SI unit is m³, and 1 m³ = 1000 L.
1 dm³ = 1 L = 1000 mL = 1000 cm³. All four values describe the same volume.
1 m³ = 1,000,000 cm³ (that is 10⁶ cm³), because 1 m = 100 cm and (100)³ = 1,000,000. Also 1 m³ = 1000 dm³ = 1000 L.
The density of water is about 1 g/mL. Since 1 mL = 1 cm³, 18 mL of water has a mass of 18 × 1 = 18 g, which is exactly 1 mole of water.
