What are lipids made of and what are they used for chemistry?

Lipids "consist of glycerol attached to a phosphate group and to two fatty acids, or carboxylic acids." "Lipid is the collective name for fats, oils, waxes and fat-like molecules (such as steroids) found in the body. Their roles include: components of cell membranes (phospholipids and cholesterol)"

Source credit: www.rsc.org/Education/Teachers/Resources/cfb/lipids.htm

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.