VG vs PG: Weight, Density and How to Measure Them

VG vs PG: Weight, Density and How to Measure Them
Understanding the difference between vegetable glycerin (VG) and propylene glycol (PG) is important when measuring and using them correctly. Although both are clear liquids, they behave very differently in terms of weight and consistency.

Why Weight and Density Matter
VG and PG are often measured in:
  • Millilitres (ml)
  • Grams (g)
Because they have different densities, the same volume does not weigh the same.

 Vegetable Glycerin (VG)
  • Thick, syrup-like liquid
  • Higher density
 Approximate density:
  • 1.26 g per ml
This means:
  • 100ml of VG ≈ 126g

Propylene Glycol (PG)
  • Thin, water-like consistency
  • Lower density
 Approximate density:
  • 1.04 g per ml
This means:
  • 100ml of PG ≈ 104g

 Key Difference
 VG is heavier and thicker
PG is lighter and thinner
Even though they may look similar, they behave very differently when measured.

How to Measure VG and PG

1. Measuring by Volume (ml)
  • Use measuring jugs or syringes
  • Best for general use
2. Measuring by Weight (g)
  • Use digital scales
  • More accurate for precise applications

Common Mistake
Assuming:
100ml VG = 100g
 This is incorrect
Because of density differences, always adjust measurements accordingly.

Why This Matters
Accurate measurement ensures:
  • Consistent results
  • Correct formulations
  • Better product performance

Conclusion 
VG and PG may look similar, but their density and weight differ significantly. Understanding how to measure them correctly will help you get the best results, whether you’re using them in food, cosmetics, or other applications.