EFH1 Ferrofluid 20ml with 90mm Petri Dish & Pipette - Science & Art (x1 Set) (F17)

Health & Safety Warning! - Ferrofluid can splash and it will stain. Wash hands with soapy water to remove it. We advise people to wear protective glasses.

A pack of 20ml tube of Ferrofluid with 90mm Petri Dish & Pipette.

Ferrofluid can be precisely positioned and controlled by an external magnetic field. The forces holding the magnetic fluid in place are proportional to the gradient of the external field and the magnetisation value of the fluid and the retention force of a Ferrofluid in a gap can be adjusted by changing either of these parameters.

A Ferro fluid, or magnetic liquid, is a stable colloidal suspension of sub-micron sized single domain magnetic particles in a liquid carrier. The particle, which have an average size of about 100€ are coated with a stabilising dispersing agent (surfactant) with prevents particle agglomeration even when a strong magnetic field gradient is applied to the Ferro fluid. A Ferro fluid contains nearly 1017 particles per ml of liquid, making up about 5% of the total volume. Each particle in the magnetic liquid behaves like a spherical permanent magnet with a North and South Pole. In the absence of an external magnetic field, the magnetic moments of individual particles are randomly distributed and the fluid has no net magnetisation. When a magnetic field is applied, the moments experience a torque and are aligned in the direction of the field.