By the Numbers

Identifying and estimating operative timescales can help win over a skeptical referee, as Tom Dursch recounts.

An appreciation of characteristic timescales can save quite a lot of effort, as Ian Wilson explains.

Katarina Babić reflects on the need to account for variability in plastic waste feedstocks when designing plastic upcycling and recycling processes.

Omar Matar explains how changes in surface tension can cause fluid flow, while navigating a sea of related dimensionless numbers.

Gareth McKinley discusses the physical interpretation that lies behind the dimensionless parameters that are so widely used by engineers.