Today's batch of civil engineering uploads is largely exam-prep hashtag spam and Shorts, so the pickings are slim. That said, this video from the tiny Education clock channel stands out as the only one with a clear, specific teaching objective baked right into the title: walking you through a void ratio calculation in soil mechanics.

Void ratio is one of those foundational geotechnical concepts that trips up students because the notation (e, n, S, G_s) gets tangled fast if you don't see a worked example. The video promises a step-by-step numerical walkthrough, which is exactly what learners need: a concrete problem, the phase diagram, identification of solid volume versus void volume, and the arithmetic that connects them. If the creator follows through on that promise, you get a compact lesson covering the relationship between void ratio, porosity, degree of saturation, and specific gravity — all from a single soil sample calculation.

A word of honest caution: at only 9 subscribers the production quality is almost certainly rough, and the description is truncated so it is hard to verify depth before clicking. But the title is specific and descriptive rather than clickbait, and a focused worked-example format is one of the most effective ways to learn geotechnical fundamentals. Compared to the hashtag-stuffed Shorts and generic "basic knowledge" videos in today's feed, this is the one most likely to actually teach you something you can apply on a problem set or in the field.