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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...

### 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...

### Density of Gases

The density of gases have been listed below in alphabetical order in the units of both metric and imperial. The chemical formula as...

### 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:
Base Quantity
Base Unit
Base Symbol
Length
Meter
m
Time
Second
s
Mass
Kilogram
kg
Temperature
Kelvin
K
Electric current
Ampere
A
Luminous...

### 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 – What are they? HVAC

All building need air conditioning. For smaller buildings this can be provided by A/C units but once the building reaches a certain size it...

### Purpose of Cooling Towers

If you look at the roof of most high rise commercial buildings, or even around industrial sites and power stations, you'll notice these large...