Pumice Quarry: Exploring Vesicularity, Bulk Density & Buoyancy

What Vesicularity Is

Vesicularity refers to the proportion of void space within a volcanic rock, such as pumice. This property is directly related to the number and size of vesicles (bubbles) present in the rock.

In the context of the simulation, vesicularity is represented by a depth-dependent profile phi(z) = 0.45 + 0.35*sin(pi*z/40), where z represents depth within the quarry face.

Bulk Density and Its Calculation

Bulk density, denoted as ρ, is a measure of mass per unit volume of a material including its void spaces. For pumice, it can be calculated using the formula: ρ = ρ_solid * (1 - φ), where ρ_solid is the density of solid rock and φ is vesicularity.

The simulation allows users to manipulate this relationship by adjusting the handling intensity slider, which collapses vesicle walls into fines, thereby altering the bulk density.

Buoyancy and Its Role

Buoyancy arises from the difference in pressure between the top and bottom of an object submerged in a fluid. In the case of pumice, its buoyant force is directly influenced by both its bulk density and the surrounding water's density.

When the bulk density of pumice drops below 1000 kg/m³, it becomes less dense than water and begins to float.

Real-World Applications

Understanding these principles is essential for various applications, such as assessing the stability of volcanic landscapes or designing structures that interact with pumice materials.

Engineers can use this knowledge to predict how pumice will behave in different environments and under varying conditions.

Frequently asked questions

Try it live

Everything above runs in your browser — open Pumice Quarry (2D): Vesicularity, Bulk Density & Buoyancy and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.