Surprise!
False. Ice is less dense than water, that's why it floats!
Which substance is less viscous
1) Honey
2) Oil
Oil is less viscous
Viscosity is......
In gases, molecules move faster as heat is added. What happens to the viscosity of a gas?
Viscosity of a gas INCREASES
What is a fluid?
Fluids are liquids and gases.
What is the term for measuring fluid flow?
Flow rate
True or False:
If a fluid has a high viscosity it also has a high flow rate.
False.
High viscosity fluids flow slower.
What is the definition of density?
A measure of mass per unit of volume.
An object is floating in water. If the object's weight is 8N and the buoyant force is 5N will the object float or sink?
The object will sink. It's weight (downward force) is greater than the buoyant force (upward force)
mL/s or cm/s
Increased viscosity, or increased resistance to flow, is caused by this between the particles.
Friction!
You pour two liquids into a cup and notice that one liquid sinks below the other forming a layer. Based on this observation, you can say this about the top layer
the top layer is less dense than the bottom layer.
When the force of gravity (weight) on an object equals the buoyant force, this is called .......
Neutral Buoyancy
This Principle is how you can find the volume of irregular solids. (Think of a bath!)
Archimedes' Principle
What happens to the viscosity in a liquid (and the particles) when heat is removed.
The particles begin to get closer together, increasing friction and the attractive forces between them, therefore the viscosity increases.
What is a way to increase the viscosity of a liquid?
Decreasing its temperature.
Why does can denser objects float in the dead sea? (use "particles" in your answer)
More salt is dissolved in the Dead Sea, increasing the number of particles in it. This makes it more dense than fresh or ocean water allowing more dense objects to float.
True or False
Water has a higher viscosity than maple syrup and flows faster.
False. Water does flow faster than maple syrup, but has a lower viscosity.
If you mixed ethanol (density = 0.94 g/mL) and methanol (density = 0.79g/mL), which one would float on top of the other?
Methanol. It's density is less.
If fluid A takes 4.3s to flow past a point while fluid B takes 5.6s to flow past the same point. Which fluid is less viscous?
Fluid A is less viscous. It took less time to flow past the point.
What do we use to measure viscosity of a liquid?
Flow rate.
What are the units for density for both a solid and a liquid
Liquid: g/mL
Two objects have the same volume. Object A has a mass of 125g while Object B has a mass of 165g. Which object will have a higher density?
Object B has a higher density because it has move mass given the same volume.