Entries - G

g (lower case)

Denotes gravity in mathematical notation.

Specifically, g is the acceleration due to the local gravitational field - the force exerted by the Earth on a sky diver in free fall, for example.

The sky diver experienced a force of 5 g. (not "5 g's")

g is measured in metres per second per second (m/s2) and has a value of 9.81 m/s2 on Earth.

Not to be confused with G.


G (upper case)

Denotes the gravitational constant in mathematical notation.

G is the constant term in Newton's law of universal gravitation, which states: "The attractive force (F) between two bodies is proportional to the product of their masses (m1 and m2), and inversely proportional to the square of the distance (r) between them."



Always lower case.


Geiger counter

Cap G.

A device for measuring radioactivity by detecting and counting ionizing particles.

Do not confuse with dosimeter.


GEM detector

The Gas Electron Multiplier (GEM) is a gaseous-ionization detector – a type of detector used in nuclear physics, particle physics and radiation detection.



Use gender-neutral language whenever the sex of the person being referred to is not made explicit.  

Thus we use spokesperson, not spokesman, firefighter, not fireman, police officer, not policeman, and actor for both sexes (not actor and actress).


Globe of Science and Innovation

Capitals on "G", "S" and "I". No italics.

There will be a public lecture today at 5pm in the CERN Globe of Science and Innovation. 



Plural: gluons

A hypothetical massless subatomic particle believed to transmit the force binding quarks together in a hadron.



Lower case.



Not gramme.

spelling, style

graphs and charts

Stories at CERN are often based on new physics results, and many of these will be accompanied by one or more graphs. 

Graphs are an excellent way to present lots of data in one place. But it is essential that the reader be given all the information necessary to understand the data presented.

Before publishing a graph or chart, check:

Are all the axes labelled?

- graphs without labels do not mean anything at all. Label your axes.

Would the labels make sense to a non-physicist?



Not gray, for the colour.



Not GRID. First capital when referring to the Worldwide LHC Computing Grid (WLCG).

The Grid is just one of many computing grids worldwide.


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