Video narration
Does one full gauge box always mean the same quantity of sand? Not when the sand is damp. In one gauge box, dry sand settles tightly, but damp sand stands higher, so it looks full sooner. A thin water film around each grain pushes neighbouring grains slightly apart. No extra sand is added; only the apparent volume increases. That is bulking. The error appears in volume batching: you fill one box and assume it contains your amount. But damp sand at that same mark contains less sand solids, so the batch is short. Bulking depends on sand grading and moisture, and reduces when the sand becomes saturated. Measure bulking with the site's approved check, then adjust the sand volume-or use weight batching. So, does one full gauge box always mean the same quantity? No. Moisture separates the grains, so correct the apparent volume before trusting it.