Taking the reader through the underlying principles of molecular translational dynamics‎,‎ this book outlines the ways in which magnetic resonance‎,‎ through the use of magnetic field gradients‎,‎ can reveal those dynamics‎.‎ The measurement of diffusion and flow‎,‎ over different length and time scales‎,‎ provides unique insight regarding fluid interactions with porous materials‎,‎ as well as molecular organisation in soft matter and complex fluids‎.‎ The book covers both time and frequency domain methodologies‎,‎ as well as advances in scattering and diffraction methods‎,‎ multidimensional exchange and correlation experiments and orientational correlation methods ideal for studying anisotropic environments‎.‎ At the heart of these new methods resides the ubiquitous spin echo‎,‎ a phenomenon whose discovery underpins nearly every major development in magnetic resonance methodology‎.‎ Measuring molecular translational motion does not require high spectral resolution and so finds application in new nmr technologies concerned with ‎'‎outside the laboratory‎'‎ applications‎,‎ in geophysics and petroleum physics‎,‎ in horticulture‎,‎ in food technology‎,‎ in security screening‎,‎ and in environmental monitoring‎.‎