Lab Report On Viscosity Of Oil

INTRODUCTION

Viscosity tells us the resistance of a fluid on which a force is acting. For fluids, it basically refers to how ‘thick’ a fluid is. This experiment was done to observe the viscosity of vegetable oil in different temperatures and how it affected the physical properties of the oil. I used a marble sphere and dropped it into the oil after heating it at different temperatures to find out how the speed of the marble increased each time after setting it to different temperatures and calculating how much time it took to hit the bottom of the beaker. My hypothesis is that, as the temperature of the oil gets higher, the density and viscosity of the oil keeps dropping.

DENSITY

Density is an important physical characteristic of any substance, and is a measure of the mass 13 per unit of volume of that substance. It is an accepted fact that vegetable oil density decreases 14 linearly with increasing temperature. This relationship can be expressed mathematically as 15
 = a + b·T where  is the density expressed in g·cm -3 17, T is the temperature expressed in ºC, a is the intercept and b is a negative slope.

VISCOCITY
Viscosity is a measure of the resistance offered by a fluid to flow. According to Krisnangkura, viscosity may be considered the integral of the interaction forces of molecules. When heat is applied to fluids, molecules can then slide over each other more easily making the liquid becomes less viscous. The effect of temperature on the kinematic viscosity