Will give

a student suspends an object from a spring scale. a spring scale measures the weight of an object. the student records the weight. the student then submerges the object in water and observes that the spring shows a smaller weight than when the object was out of the water. the student then submerges the object in motor oil, vegetable oil, milk, and gasoline and observes the reading on the scale.

the independent variable in this experiment is the:
the weight read on the spring scale
the type of liquid in which the object was submerged
the size of the object
the amount of liquid in which the object was submerged

the amount of liquid in which the object was submerged

Explanation:

As we know that spring balance will read the spring force that is exerted by spring on the object

Now when the object is suspended by the spring then in that case the spring force is balanced by the weight so spring will read the correct mass of the object.

Now the object is suspended by the spring and then submerged into the liquid so in that case we can say

so here the reading will be less and it depends on volume of object and density of liquid

so independent variable will be

the amount of liquid in which the object was submerged

the area between the graph and the t axis

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.