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# How the spray bottle works ? Fluids - Pressure

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## Lucas Kristensen

on 19 March 2011

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#### Transcript of How the spray bottle works ? Fluids - Pressure

How the Spray Bottle Works ? How does the spray bottle work ?

The way that the spray bottle sprays liquids out of the nozzle is by using a very simple device called a one-way valve. A one-way valve is a device that only lets the bottle spray liquids out, but it doesn't let them in. The spray bottle has two one-way valves: one is between the pump and the reservoir and one is between the pump and the nozzle. A small piece of rubber (usually a small ball) is placed in the valve between the pump and the reservoir and the other one in the valve between the pump and the nozzle. When the trigger is clenched, the pressure in the tank causes the reservoir to push the liquid up. When the trigger is released, the pressure in the reservoir equalizes, and pushes the liquid out of the valve. Step by step explanation on how it works.

Step 1. The water inside the tank is taken into the reservoir due to the difference in pressure. (Increase)

Step 2. The water is carried out through the first one-way valve when the trigger is pulled.

Step 3. When the trigger is released the water reaches the last point, the second one-way valve, where it is ejected. How does it relate to the scientific knowledge learned in Chapters 7-9?

In my case, I chose water as a fluid. A fluid is described as any form of matter that can flow.
Density allows water to move from the reservoir upwards and out of the bottle. Water particles have enough space between them to change position and thereby to move. Water in the bottle will move due to changes in pressure. The density of the air inside the bottle is low, and that's why the particles can move independently.

Water's viscosity is low, allowing it to easily flow through the pipe, valves and out of the bottle. When the trigger is pulled, the pressure inside the bottle increases, causing the water to move. When the trigger is pulled due to contact force, the pressure is created.

The water in the bottle was pulled upwards because of the Buoyant force, which is defined as the upward force exerted by fluid. Hydraulic systems are devices which create pressure that moves through the liquids. In my case when the trigger is pulled, the pressure in water increases, causing the water to move.

Two check valves are used in the spray bottle, which only let water come out, but do not let any water in.

Due to dynamic pressure water performs immediate tasks (when spraying it out of the bottle).
What are the impacts on society?

I believe that this system is similar to the sprinkler system used to water plants and vegetables.
These systems have evolved so much that they can be programmed to water at certain times. This can be very important, especially in areas, which lack water. (on others, they are used to save the water) There can also be a negative impact: e.g. Windex and/or perfumes contain substances that cannot be absorbed by nature and therefore can ruin the ozone layer.

This system is also used in the following industries: cleaning products, perfumes and airbrush painting etc. How does it relate to other subject curriculum? How can I demonstrate this?

The science behind the spray bottle connects with these subjects:

-Math: It relates to math because to figure out the amount of pressure exerted on the reservoir you need to use division.
P = F/A

-Social Studies: I can relate this to social studies because the spray bottle can have a negative impact on the environment.
The chemicals that are often in spray bottle's (Windex and perfumes) are ruining the ozone layer. What are the core vocabulary terms associated and how do they relate to the function?

Chapter 7.1

Kinetic energy: Is the energy of motion.

Pressure: Is the amount of force acting over a given area on an object.

Contact force: Are forces that can have an effect on object that they touch.

Chapter 8.3

Viscosity: Is the resistance of a liquid to flow.

Chapter 8.2
Contact force: Are forces that can have an effect on object that they touch.

Pressure: Is the amount of force acting over a given area on an object.

Chapter 9.1

Buoyant force: Is the upward force exerted by a fluid.

Chapter 9.2

Hydraulics: Is the study of pressure in liquids.

Hydraulic system: Are devices that create pressure that moves through a liquid such as water.

Valve: Is a device for controlling the passage of fluid through a pipe.

Check valves: Are valves that allow fluids to flow in only one direction.

Pneumatics: Is the use of gas in an enclosed system under pressure. How does it relate to the scientific knowledge learned in Chapters 7-9?

In chapter 7 the following definitions were given: Fluid, density, kinetic energy.
In chapter 8 the following definitions were given: Viscosity, Pressure, Contact force.
In chapter 9 the following definitions were given: Buoyant force, Hydraulics, Hydraulic systems, Valves, Check valves, dynamic pressure. Links:
http://www.howstuffworks.com/question673.htm Bibliography:
http://www.howstuffworks.com/question673.htm
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