Simple introduction to units. Why is the equation "2 + 2 = 5" more correct than you may think?

First, making a calculation without utilizing the Powersim units, then showing how to implement units on that model. For beginners. Showing Liters + bottles, Liters + m³, E=1/2mv², € to $ and $ + €, and how Liters + Days gives an error message. After watching the video, you will agree that anything but 5 will be a silly result of the equation 2+2. :-)

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