Final answer:
Converting 0.634 litres to millilitres requires multiplying by 1000, giving 634 millilitres; however, the question lacks complete information to calculate a final volume using Boyle's Law or any other formula.
Step-by-step explanation:
To find the final volume V2 in millilitres, a conversion from litres to millilitres is necessary. Knowing that 1 litre equals 1000 millilitres, we multiply the volume in litres by 1000 to get the volume in millilitres. However, the question seems to contain some information that is either incomplete or irrelevant, such as the number '39.6' with an unspecified unit or context, making it impossible to provide a complete answer based on the information provided. If we had a complete problem statement, for example, stating a relationship between two sets of conditions using Boyle's Law, we could calculate the final volume after making necessary conversions.