BTW, a physical scientist will use g to represent the standard acceleration (not, properly speaking, force) of gravity at Earth’s surface (about 32 ft/sec^2 or 9.8 m/sec^2), and G for the universal gravitational constant (the constant that you multiply by the product of two masses and divide by the square of the distance between them to obtain the gravitational force between them). But non-scientists often use the capital and lower-case indiscriminately.
Interesting fact: the force of gravity at the altitude of the International Space Station is about 90% of what it is at Earth’s surface. I.e., if you could climb a ladder to that height, you’d only weigh about 10% less that you do here. Thus, it’s not really “microgravity” in the sense of being in an extremely weak gravitational field--the apparent absence of gravity is due to the fact that everything is in free fall together.