23. Which of the following substances could be expected to provide the greatest relief
for an acid stomach?
(1) bottled spring water
(2) baking soda in water
(3) lemonade
(4). salt water
(5) strong coffee

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

it is the most commonly accepted one

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa