You can also contribute to your vitamin A intake by including good sources of beta-carotene in your diet, as this can be converted into vitamin A by the body. The main food sources of beta-carotene are: 1  yellow, red and green (leafy) vegetables, such as spinach, carrots, sweet potatoes and red peppers.itamin A. Vitamin A is also known as retinol and has several important functions. These include: 1  helping your immune system to work as it should against infections. 2  helping vision in dim light. 3  keeping skin and the linings of some parts of the body, such as the nose, healthy.
Density is a physical characteristic, and is a measure of mass per unit of volume of a material or substance. Density is mass divided by volume.
The mass of an object divided by it's volume equals DENSITY.  DENSITY= MASS/ VOLUME  Density is mass per unit volume.