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### Density explained!

What is density?
Each material has a different density, the difference depends on how the materials particles are packed together. If the particles of a material...

### Thermodynamic properties of refrigerant R-134a

Thermodynamic properties of refrigerant R-134a, also known as 1,1,1,2-tetrafluoroethane, R-134a, Freon 134a, Forane 134a, Genetron 134a, Florasol 134a, Suva 134a or HFC-134a and norflurane...

### Specific heat capacity of materials

The specific heat capacity of materials ranging from Water to Uranium has been listed below in alphabetical order. Below this table is an...

### Electrical Resistance

What is resistance?
Resistance is the opposition to the flow of electrons in a circuit through a conductor. If you need to refresh on how...

### What is Current? Electricity fundamentals

Electricity is the flow of electrons from one atom to another. When we talk about current with regards to electricity, we are referring to...

### Combine date and time cells in excel

You can easily combine date and time of two different cells in excel, all you have to do is enter the following into the formula...

### How to combine multiple cells in excel

Combine two cells in excel with a space between.
You can easily combine two different cells in excel, all you need to do is enter...

### SI Units

The SI units of measurement are based on seven quantities, other commonly used quantities are derived from these.
SI Base units:
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### Volume of a sphere

The volume of a sphere can be calculated using the following formula
V = (4÷3) x Π x r3
Where
V = Volume (m3)
Π = Pi (3.142 approx)
r...

### Chillers, AHU, RTU How they work

In this article we will be looking at how chillers, AHU's and RTU's work together, the difference between them and the basic working principles...

### How thermostatic expansion valves work

In this article we'll be learning how thermostatic expansion valves work. The expansion valve is an essential component in almost every refrigeration cycle and...