Question

Volume is an unreliable measurement because 

A. there's no standard size of measuring cup or spoon.  
 B. solids can't be measured accurately by volume.   
C. food expands or contracts in different temperatures.  
 D. gas weighs less than liquid.

Answer 1

D cause gas is an air unless you mean car gas then anyways its D

Answer 2

Answer with explanation:

Why volume is an Unreliable Measurement, This can be explained by taking example of Compound water.

There are three states of water

1. Solid state , which is when temperature goes below 0° C

2. Liquid State,when temperature goes above 0° C

3. Gaseous state, when temperature goes above 100°C.

When you measure , water in three different States in any container ,their mass or volume's are different.That's one of the reason Volume is considered to be unreliable measurement .

Option D: gas weighs less than liquid.