# Gouy balance

The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility of a sample.wikipedia
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### Louis Georges Gouy

Gouy
The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility of a sample.
He is the namesake of the Gouy balance, the Gouy–Chapman electric double layer model (which is a relatively successful albeit limited model that describes the electrical double-layer which finds applications in vast areas of studies from physical chemistry to biophysics) and the Gouy phase.

### Magnetic susceptibility

susceptibilitymagnetic susceptibilitiesvolume magnetic susceptibility
The Gouy balance, invented by Louis Georges Gouy, is a device for measuring the magnetic susceptibility of a sample. Gouy derived a mathematical expression showing that force is proportional to volume susceptibility for the interaction of material in a uniform magnetic field in 1889.
Early measurements are made using the Gouy balance where a sample is hung between the poles of an electromagnet.

### Weighing scale

scalesscalebalance
In use, a long, cylindrical sample to be tested is suspended from a balance, partially entering between the poles of a magnet.

### Evans balance

In the Gouy balance there is a homogeneous field in the central region between two (flat) poles of a permanent magnet, or an electromagnet.

An alternative method for measuring magnetic susceptibility is the Gouy balance.

### Kibble balance

Watt balanceKibble (or watt) balance
* Gouy balance

### Magnetic field

magnetic fieldsmagneticmagnetic flux density
Gouy derived a mathematical expression showing that force is proportional to volume susceptibility for the interaction of material in a uniform magnetic field in 1889.

### Magnet

permanent magnetmagnetspermanent magnets
In use, a long, cylindrical sample to be tested is suspended from a balance, partially entering between the poles of a magnet.

### Paramagnetism

paramagneticparamagnetParamagnetic materials
A sample with a paramagnetic compound will be pulled down towards the magnetic, and provide a positive difference in apparent mass m b – m a.

### Diamagnetism

diamagneticdiamagnetLandau diamagnetism
Diamagnetic compounds can either exhibit no apparent change in weight or a negative change as the sample is slightly repelled by the applied magnetic field.

### Gravitational acceleration

acceleration due to gravityacceleration of gravityg

### Thermostat

thermostatsdigital thermostatsheating control
The sample can also be enclosed in a thermostat in order to make measurements at different temperatures.

### Electromagnet

electromagnetselectro-magnetelectromagnetic
The stationary magnetic of a Gouy balance is often an electromagnet connected to a power source, since balance recordings with and without the applied magnetic field are required of the procedure.

### Magnetochemistry

high-spinmagnetic chemistrymagnetic moments

### Non-Kekulé molecule

biradicalcannot be given a Kekulé structureoxyallyl
Eugene Müller, with the aid of a Gouy balance, established for the first time that these compounds are paramagnetic with a triplet ground state.

### Cecilie French

She collaborated on research with Violet Trew at Bedford College until the arrival of the Gouy balance at QMC whereupon she began collaborating with D. Harrison there instead.

### Measuring instrument

instrumentscientific instrumentinstruments
*Gouy balance