What factors affect the weight of transformer oil?

Transformer oil weight depends on oil density, which varies by oil type, formulation, and temperature. Mineral oils typically have density below water, while ester and silicone fluids can differ. Temperature has a strong effect, with warmer oil less dense. Weight also depends on volume handled and whether the oil contains dissolved gases or moisture. For logistics, operators use density at a reference temperature to convert liters to kilograms.