What are good testable questions?

What are good testable questions?

• How does the amount of water effect the growth of plants?
• How does the amount of light effect the growth of plants?
• How does the type of dirt (sand vs.
• How does music effect the growth of a plant?
• How does temperature effect the growth of a plant?

What is a good question for a science experiment?

Examples. These are examples of good science fair project questions: How does water purity affect surface tension? When is the best time to plant soy beans?

Which material is the best insulator experiment?

Wool was the best insulator followed by shredded paper and then polystyrene. These results again make the experiment valid, because wool, polystyrene and shredded paper are used for home insulation (as researched) as they do slow down the movement of heat by interfering with heat convection currents.

How do I choose a good science fair project?

3 Strategies for an Original Science Fair Project

1. STEP 1: Based on observations, ask a question.
2. STEP 2: Predict the answer to the question (we call that prediction a hypothesis)
3. STEP 3: Design an experiment to generate data to test the hypothesis (easier than it sounds)
4. STEP 4: Analyze the data to determine if the prediction should be accepted or rejected.

Which paper towel brand is the strongest science experiment?

Bounty

How do you make your own science experiment?

The steps to the Scientific Method are:

1. 1) Pose a Testable Question.
2. 2) Conduct Background Research.
3. 3) State your Hypothesis.
4. 4) Design Experiment.
5. 5) Perform your Experiment.
6. 6) Collect Data.
7. 7) Draw Conclusions.
8. 8) Publish Findings (optional).

How does water purity affect surface tension experiment?

You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does. This is because plain tap water has higher surface tension, so the surface is “stronger” and can hold together a larger drop.

What liquid has the highest surface tension?

mercury

Why does soap lower surface tension?

Soap molecules are composed of long chains of carbon and hydrogen atoms. This separates the water molecules from each other. Since the surface tension forces become smaller as the distance between water molecules increases, the intervening soap molecules decrease the surface tension.

Why does surface tension happen?

Surface tension in water owes to the fact that water molecules attract one another, as each molecule forms a bond with the ones in its vicinity. This inward net force causes the molecules on the surface to contract and to resist being stretched or broken.

What factors affect surface tension?

Surface tension is caused by the effects of intermolecular forces at the interface. Surface tension depends on the nature of the liquid, the surrounding environment and temperature. Liquids where molecules have large attractive intermolecular force will have a large surface tension.

How does surface tension change with temperature?

The strength of surface tension depends on intermolecular forces. As temperature increases, molecules of liquid become more active and they move more rapidly; therefore, the intermolecular forces are more instable. Surface tension decreases with increasing temperature.

Why does surface tension act tangentially?

Particles on the surface have equal force along the side and due to this tensile stress is generated. The distance between the particles in the air is greater than the distance between particles in water. Hence, the net cohesive force acts downward.

Where does the surface tension act?

Surface tension, property of a liquid surface displayed by its acting as if it were a stretched elastic membrane. This phenomenon can be observed in the nearly spherical shape of small drops of liquids and of soap bubbles. Because of this property, certain insects can stand on the surface of water.

What is the direction of surface tension force?

Surface tension is a kind of hypothetical tension in which liquid molecules undergo tension force at the surface. Thus it should be a pulling force due to asymmetry. But many times in my books i have seen it acting in opposite direction.

Why is surface tension a force parallel to the interface?

The surface tension is exactly the constant of proportionality between energy and surface area. Since the energy doesn’t change if you move the interface in the direction normal to the interface, there is no component of stress normal to the interface, so the stress is entirely in the plane of the interface.

Does surface tension acts within the inside of a liquid?

Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension. Molecules inside the liquid experience zero net force, since they have neighbors on all sides.

What is the CGS unit of surface tension?

Surface tension, represented by the symbol γ (alternatively σ or T), is measured in force per unit length. Its SI unit is newton per meter but the cgs unit of dyne per centimeter is also used.

What are the dimensions of surface tension?

Surface Tension (T) = Force × Length-1. Or, T = [M1 L1 T-2] × [L-1] = M1 T-2. Therefore, surface tension is dimensionally represented as M1 T-2.

Does tension and surface tension have same dimensional formula?

a) Tension and surface tension. Since tension is a type of force, it will also have the same dimensional formula as the dimensional formula of force i.e. [MLT-2].

What is surface tension and its SI unit?

The SI unit of Surface Tension is Newton per Meter or N/m.

How is surface tension related to surface?

Because of cohesive forces across liquid molecules, surface tension causes the existence of a thin film (layer) across the surface. Surface energy is the work done per unit area to produce this new surface.

What is 11th surface tension?

Surface tension is the property of any liquid by virtue of which tries to minimize its free surface area. Surface tension of a liquid is measured as the force acting per length on an imaginary line drawn tangentially on the free surface the liquid. Surface tension S = Force/Length = F/l = Work done/Change in area.

Is surface energy and surface tension same?

Thus, for liquids the surface tension and the surface energy are equal. The same considerations apply to liquid-liquid interfaces.

Do solids have surface tension?

Researchers have shown that surface tension on a solid material is unconnected to the energy required to create a new surface. Consequently, surface tension on a solid does not exist in its conventional meaning. It is believed to provide the connection between surface tension and surface energy.

Does salt increase the surface tension of water?

Compounds that lower water’s surface tension are called surfactants, which work by separating the water molecules from one another. Adding salt to water does increase the surface tension of water, although not by any significant amount. …

Does air have surface tension?

No, Air do not have surface tension. A surface is required for the existence of surface tension. For example:- When we put liquid in a container then at the top of water level there is a surface (of liquid) between two phases a liquid phase and a gaseous phase. So, liquid has surface tension.

Why Surface tension decreases with increase in concentration?

The surface tension decreases with increase in concentration. This is due to breaking of hydrogen bonds when surfactants are added in water, leading to higher adsorption at the air-water interface. This allows an increase in interfacial area without overall increase in energy [31].