What factors influence the porosity of a rock?

What factors influence the porosity of a rock?

The principal factors that control porosity are grain size and shape, the degree of sorting (a well-sorted sediment has a narrow range of grain size), the extent to which cement occupies the pore spaces of grains and the amount of fracturing.

How does porosity affect the amount of water that could stay between rock particles?

Porosity (how well rock material holds water) is also affected by the shape of rock particles. Round particles will pack more tightly than particles with sharp edges. Material with angular-shaped edges has more open space and can hold more water.

What are the controls on porosity?

2.2 Controls on Porosity These are grain size, grain packing, particle shape, and the distribution of grain sizes.

What factors do not affect porosity?

Interestingly, grain size does not affect porosity. For example, consider a box filled with spherical particles packed as tightly as possible.

Which type of rock are highly porous?

Which types of rocks are highly porous? Explanation: Sedimentary rocks are relatively porous because there is a great variation in degree of packing on the one hand and in size, shape and arrangement of the grains on the other hand.

What is the main characteristic of porosity?

Porosity is the fraction of the volume of an apparent solid that is actually empty space. Owing to porosity, the surface area inside a coal particle is far higher than the external surface area. In any gas-solid or liquid-solid reaction, the rate of reaction…

What are the three types of porosity?

There are three levels of porosity: low, medium, and high.

Which rock has highest permeability?

Gravel
Gravel and sand are both porous and permeable, making them good aquifer materials. Gravel has the highest permeability.

What factors affect porosity?

On the whole, porosity is directly dependent on the initial water content, temperature, pressure, relative humidity, air velocity, electromagnetic radiation, food material size, composition, and initial microstructure and viscoelastic properties of the biomaterial, as shown in Fig.

How does particle size affect the porosity of a rock?

In between the particles are spaces that are filled with gas, air or liquid. Particles’ shapes and sizes affect how they aggregate, including how tightly they can pack together, which affects a rock’s porosity—a property that is the ratio of the volume of a rock’s empty spaces to its total volume.

What makes up the particles of a rock?

Rocks—and most other objects, for that matter—are made up of particles of varying sizes that are packed together. In between the particles are spaces that are filled with gas, air or liquid.

How is porosity a property of organic matter?

Extra: Soil is a mixture of rocks, minerals and organic matter. Porosity is also a property of soil. Try the same activity using different types of soil: clay, loam, sandy, silty, potting soil, compost, etcetera, but put a screen on top of the cup to keep organic matter from floating out as you pour the water into the cup.

Which is more porous granite or volcanic rock?

The granite is heavier than the volcanic rock. The many large holes of air in the latter make it less dense—and more porous—than the granite, which also makes it lighter. Something that has more holes in it is more porous. So “porosity” is one characteristic that can help tell you what kind of rock you have.