Question

A 1 litre jar full of lead pellets is melted down and cooled to form 750ml of solid lead. What was the porosity of the original jar of pellets?

A) 33%
B) 0.25
C) 250 ml
D) 3:1

Answer 1

To find the porosity of the original jar of lead pellets, subtract the volume of the solid lead from the volume of the jar and divide by the volume of the jar. The porosity is 0.25.

Step-by-step explanation:

To find the porosity of the original jar of pellets, we need to calculate the volume of the solid lead and compare it to the volume of the jar. The jar is initially full, so its volume is 1 liter. When it is melted down and cooled, it forms 750ml of solid lead. This means that the volume of the solid lead is 750ml. To find the porosity, we can subtract the volume of the solid lead from the volume of the jar and divide it by the volume of the jar:

Porosity = (Volume of jar - Volume of solid lead) / Volume of jar = (1000ml - 750ml) / 1000ml = 250ml / 1000ml = 0.25

Therefore, the porosity of the original jar of pellets is 0.25, which corresponds to option B