Question

21 millimeters is what percent of 1 km?

Answer 1

Answer:

(i) We know the basic relation that

1km = 1000m

1 m = 1000 mm

Therefore 1 km = 1000×1000

= 106 mm

We also know that

1 m = 1012pm

Therefore 1 km = 1000× 1012 pm

= 1015pm

(ii) We know the basic relation that

1 kg = 1000 g

1 g = 1000 mg

So, 1 mg = 10-3g

Therefore 1 mg = 10-3 × 10-3 kg

= 10-6 kg

1 g = 109ng

1000 mg = 109 ng

1 mg = [109]/103 ng

= 106 ng

(iii) We know the basic relation that

1 L = 1000 ml

∴ 1 ml = 10-3 L

1 ml = 10-3 dm3

Answer 2

Answer:

Step-by-step explanation: