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Why is chlorine's atomic mass 35.5? Isotopes explained
Chlorine's relative atomic mass is 35.5 because natural chlorine is a mixture of two isotopes, chlorine-35 and chlorine-37, and about ...
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Chemistry
Why is chlorine's atomic mass 35.5? Isotopes explained
Chlorine's relative atomic mass is 35.5 because natural chlorine is a mixture of two isotopes, chlorine-35 and chlorine-37, and about ...
Physics
How to read distance-time and velocity-time graphs
To read a motion graph, read the vertical axis first. On a distance-time graph, the gradient is the speed and a flat line means stopped. O...
Maths
How to share in a ratio: why 2:3 is not 2/3
To share an amount in a ratio, add the parts, divide the amount by that total to find one part, then multiply. For £50 in the ratio 2:3, t...
Builds
What is a bit and a byte? Logic gates using switches
A bit is one binary digit, 0 or 1, like a switch that is off or on. In a circuit, the bit is the voltage on a wire: 3.3 V for 1, 0 V for 0...
Geography
How to Read a Climate Graph: Weather vs Climate
To read a climate graph, read the axes first. The months run along the bottom, the bars show rainfall in millimetres (mm) on one vertical ...