# Why is air considered to be a fluid?

Any substance that flows is considered a fluid. This includes such things as water, shampoo, sunscreen, and even honey. Although not necessarily obvious, even gases, such as air, can be classified as fluids. This activity will allow students to 'pour' a gas and watch the results.
A.

### What is the resistance of a fluid to flow?

One is more viscous than the other is. Viscosity is a term used to describe resistance to flow at a particular temperature. A liquid with a high internal resistance to flow is described as having a high viscosity (such as honey at room temperature).
• #### When an inflated balloon is exposed to cold air what happens to the volume?

Solids, Liquids, and Gases Review
What happens to the volume of an inflated balloon when it is exposed to cold air?DECREASES
What does a graph that shows the pressure of a gas varies inversely with its volume under constant temperature demonstrate?BOYLE'S LAW
• #### What is the difference between the two types of vaporization?

Vaporization of a sample of liquid is a phase transition from the liquid phase to the gas phase. There are two types of vaporization: evaporation and boiling. Evaporation occurs at temperatures below the boiling point, and occurs on the liquid's surface.
• #### What is it called when a substance changes directly from a solid to a gas?

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. The reverse process of sublimation is deposition, in which a substance passes directly from a gas to a solid phase.
B.

### What is the definition of water resistance?

Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured watches were exposed to in a leakage test.
• #### How far is 20 bar?

Though it might seem like it, this actually isn't dive watch territory. While 200 meters seems like a ton of leeway to scuba dive with, even down 10 meters, it's probably best not to risk it. But by all means, do some laps in the pool with these on. But only push the buttons with your wrist above water.
• #### Is water resistant and waterproof the same thing?

Water-resistant: able to resist the penetration of water to some degree but not entirely. Water-repellent: not easily penetrated by water, especially as a result of being treated for such a purpose with a surface coating. Waterproof: impervious to water.
• #### What is 3atm waterproof?

30m, 3 atm = Splash resistant. Ok for rain, hand washing, other occasional contact with water. 50m, 5 atm = Suitable for swimming, fishing, other outdoor activities. 100m, 10 atm = Suitable for snorkeling and other prolonged contact with water, but not for scuba. https://en.wikipedia.org/wiki/Water_Resistant_mark.

Updated: 2nd October 2019