volume: the amount of space something takes up! bathtub
TRANSCRIPT
Volume: the amount of space something takes up!
BATHTUB
BATHTUB
What happens to the level of the water when you step in a bathtub?
What happens to the level of the water when you step in a bathtub?
BATHTUB
Volume or Water Displacement
• Water is generally incompressible.• An object will displace a volume of
water equal to the volume of the object itself when submerged.
• Both cm3 and ml measure volume or the amount of space an object takes up.
• 1ml is = 1cm3
• Water displacement is useful for determining the volume of irregularly shaped objects.
TOILET WATER
DETENTION!
---60ml
If you place a large screw into a graduated cylinder with 60ml of water in it and the water level rises to 80ml, what is the volume of the screw?
1ml = 1cm3
---60ml ---60ml
---80ml
If you place a large screw into a graduated cylinder with 60ml of water in it and the water level rises to 80ml, what is the volume of the screw?
---60ml ---60ml
---80ml
If you place a large screw into a graduated cylinder with 60ml of water in it and the water level rises to 80ml, what is the volume of the screw?
The difference is 20ml
---60ml ---60ml
---80ml
If you place a large screw into a graduated cylinder with 60ml of water in it and the water level rises to 80ml, what is the volume of the screw?
20cm3
1ml = 1cm3
The difference is 20ml
---57.4ml ---57.4ml
---81.6ml
If you place a large screw into a graduated cylinder with 57.4ml of water in it and the water level rises to 81.6ml, what is the volume of the screw?
---57.4ml ---57.4ml
---81.6ml
If you place a large screw into a graduated cylinder with 57.4ml of water in it and the water level rises to 81.6ml, what is the volume of the screw?
Get the difference!Final – initial position
81.6ml – 57.4ml = 24.2ml
---57.4ml ---57.4ml
---81.6ml
If you place a large screw into a graduated cylinder with 57.4ml of water in it and the water level rises to 81.6ml, what is the volume of the screw?
Get the difference!Final – initial position
81.6ml – 57.4ml = 24.2ml
24.2cm3
1ml = 1cm3
YOUR TASK
Measure the volume of a large screw ________ Measure the volume of a 10g mass________
What is the screw’s density?________
A paper clip is too small to accurately measure its volume. Come up with a method that can be
used to determine the volume of one paper clip. Write it down in your notebook.
What is the volume of a single paper clip______
Read at the base of the meniscus!Keep it flat, read at eye level!
What if an object is too big to fit in a
graduated cylinder?
1) You might consider using a beaker instead but in general a graduated cylinder is far more accurate at measuring volume than a beaker.
2) So we can use something called an overflow can.
Overflow Can.
1) Fill the can above the drain line with water.
2) Let the excess drip out until the water is level with the drain.
3) Now any object placed in it will cause the water to overflow through the drain.
Overflow Can.
1) Fill the can above the drain line with water.
2) Let the excess drip out until the water is level with the drain.
3) Now any object placed in it will cause the water to overflow through the drain.
4) Catch the water in a graduated cylinder or other device and measure its volume in ml.
5) This is the volume of the object in cm3
CLASS ACTIVITY
Determine the density • a rock:• a 200g mass• a 500g mass
•What metal is the mass made of? (use the internet to look up your density value).
DENSITY
CLASS ACTIVITY •Determine the mass in grams of the following volumes of water:
VOLUME (ml) MASS (g)
5
20
32
40
46
50
Pattern?
Key Points•Water displacement is used to determine the volume of irregularly shaped objects.
•Milliliters (ml) and centimeters cubed (cm3) are interchangeable.
1ml = 1cm3
•For H2O 1g = 1ml = 1cm3