Category: Physics

Air-Fuel Ratio

Air-Fuel Ratio

Air-Fuel Ratio

03/18/26

“What’s so special about the mass of air to fuel in a combustion process?”

Combustion reactions require air and fuel to operate. The quality of the reaction is determined by the ratio of air to fuel mass present, also called the Air-Fuel Ratio. The air-fuel ratio is usually represented by the amount of air compared to fuel. For example, an air-fuel ratio of 8:1 means that for every 8 kg of air, there is 1 kg of fuel.If there is too little air in the ratio, some fuel will not burn. If there’s too much air, then there will not be enough fuel present to burn effectively.

Fugacity

Fugacity

Fugacity

03/14/2026

“How can we quantify how much a substance wants to escape from its mixture?”

Different substances have different levels of internal stability. Some very much want to escape their mixture, while others are happy where they are. So how can we quantify this? Well, scientists developed Fugacity theory to explain this phenomenon. Fugacity is defined as the empirically measured vapor pressure rather than the ideal vapor pressure. Chemicals will move between substances like air and water until their fugacity potentials are equal.

Hydraulic Gradient Lines vs Energy Gradient Lines

Hydraulic Gradient Lines vs Energy Gradient Lines

Hydraulic Gradient Lines vs Energy Gradient Lines

03/07/26

“What is the difference between a fluid’s hydraulic gradient line and energy gradient line?”

Engineers often have to compute the hydraulic gradient line and energy gradient line for fluid flow. But what is the difference between them, and why does it matter? Well, the hydraulic gradient line represents how high the fluid would rise if a piezometer tube were placed at a specific point, given by the summation of pressure and elevation for a given fluid. The energy gradient constitutes the total energy of a fluid at a particular point, given by the summation of pressure, elevation, and velocity. The difference between the hydraulic line and the energy gradient line is the fluid’s velocity. One of the reasons why these are different is that it shows how the stored energy of the hydraulic gradient and the energy of motion of velocity are separate quantities, and another is that we often need different tools to measure the hydraulic gradient and velocity of a system, so we can combine them to find the energy gradient line. This is the difference between the Hydraulic Gradient Lines vs Energy Gradient Lines.

Soil Infiltration vs Transmission Rates

Soil Infiltration vs Transmission Rates

Soil Infiltration vs Transmission Rates

03/05/26

“What is the difference between soil infiltration and transmission rates?”

Soil infiltration and transmission rates are often discussed interchangeably. However, there are big differences between them. Infiltration rate measures how quickly water enters soil from the surface, while transmission rate calculates the movement rate of water through soil. Soil infiltration rate is influenced by surface conditions and the level of soil inundation, while transmission rates are governed by soil permeability. This is the difference between Soil Infiltration vs Transmission Rates.

Material Toughness

Material Toughness

Material Toughness

02/19/26

“How can we measure how much energy a material can absorb before rupture?”

People need materials to absorb energy before rupture. The more energy an item can absorb, the higher its Material Toughness, and the better it will perform for tasks that require heavy resistance to heavy energy shocks. Material toughness is measured by the area under the curve in a stress-strain diagram. Material toughness can be thought of as a combination of hardness and ductility.

Tensile Strength

Tensile Strength

Tensile Strength

02/18/26

“How can we measure an object’s resistance to being pulled apart?”

Pulling an object exerts stress on its atoms. Different materials will have different amounts of resistance to being pulled apart, summarized by the word Tensile Strength. The largest stress value it can handle before breaking is known as Ultimate Tensile Strength. Tensile is often one of the most important properties engineers must consider in material selection.

Plastic Deformation

Plastic Deformation

Plastic Deformation

02/16/26

“How do objects become permanently distorted?”

Objects may undergo reversible distortions when stretched slightly. But if the applied stress goes beyond the yield point, then the deformations will become permanent. This phenomenon, known as Plastic Deformation, is a factor that engineers must deal with in material design. Items undergoing plastic deformation will become stronger in terms of load-bearing capacity until they reach the ultimate strength, after which the item will become less strong and eventually break.

Yield Point

Yield Point

Yield Point

02/14/26

“At what point is a material so stressed so much that it doesn’t return to its original form?”

Materials stretched by a small amount may return to their original shape. But if they’re stretched beyond a certain Yield Point they may not return. Materials that move beyond the yield point transition from elastic to plastic behavior.

Image credit: https://pubs.sciepub.com/

Superheated Water

Superheated Water

Superheated Water

02/10/26

“How can water stay in liquid form while hotter than its boiling point?”

Water at atmospheric pressure levels boils at 100 degrees celsius. But if water is subject to high pressures, it can become Superheated Water at higher temperatures. Superheated water is useful for a multitude of industrial applications such as cleaning and heating.