What is the First Law of Thermodynamics?

With the a little hydrogen, a few balloons and a couple of makeshift rockets, Valeska Ting launches into an explanation of what the first law of thermodynamics is, and why it matters to our lives.
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We've all heard the rule that states that ‘energy cannot be created or destroyed’, or ‘energy is always conserved’. But what does that mean? Chemical engineer Valeska Ting explains.

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Видео What is the First Law of Thermodynamics? канала The Royal Institution