common measurement tools used in the biology lab
DESCRIPTION
COMMON MEASUREMENT TOOLS USED IN THE BIOLOGY LAB. Graduated Cylinder. This tool is used to measure the VOLUME of a liquid. The proper way to read this tool is at EYE LEVEL at the bottom of the MENISCUS, which is the curved surface of the liquid. - PowerPoint PPT PresentationTRANSCRIPT
*COMMON MEASUREMENT TOOLS USED IN THE BIOLOGY LAB
*Graduated Cylinder
This tool is used to measure the VOLUME of a liquid.
The proper way to read this tool is at EYE LEVEL at the bottom of the MENISCUS, which is the curved surface of the liquid.
*What is the curved surface of the liquid called in a graduated cylinder?
MENISCUS
1) 7 mL
2) 38 mL
3) 33 mL
4) 20 mL
What is the volume of the rock?
5) 20 mL
*METRIC RULERMetric rulers are used to measure length, width, and height.
The LARGE numbers on the ruler are CENTIMETERS. The small lines between the centimeter marks are called MILLIMETERS.
There are TEN (10) millimeters in a centimeter.
*What do the NUMBERED lines on a metric ruler represent?
What do the SMALL lines between the numbered marks represent?
CENTIMETERS
MILLIMETERSHow many millimeters in a one (1) centimeter?10 mm
*What is the length of the screw in centimeters?
In millimeters?
5.1 centimeters (5.1 cm)
5.1 cm X 10 = 51 millimeters (51 mm)
*Celsius Thermometer
Thermometers are used to measure TEMPERATURE.
Since scientists use the METRIC SYSTEM, they use thermometers that measure degrees Celsius rather than degrees Fahrenheit.
*What is the temperature in degrees Celsius?
17 degrees C
*ELECTRONIC BALANCE
An electronic balance is used to measure the MASS of an object.
It is a more PRECISE tool than a triple beam balance because it can record mass to the hundreth of a GRAM.
*Record the mass of the items.
To the nearest WHOLE number:
45 grams (45 g)
To the nearest tenth:
45.2 grams (45.2 g)
*Safety Tools Used in the Biology Lab
1.GOGGLES – Protect Eyes
2. GLOVES – Protect Skin
3. APRON – Protect Clothes
*Safety Tools Used in the Biology Lab
TEST TUBE RACKUsed to support test tubes during experiments
TEST TUBE HOLDERUsed to hold hot test tubes or while heating a test tube over a flame
*Safety Tools Used in the Biology LabTONGS – Used to safely handle hot beakers
SAFETY SHOWER – To wash chemicals off if they splash on skin
EYE WASH STATION – To flush eyes
*Glassware & Other Tools Used in the Biology Lab
BEAKER – Used to transfer and/or mix larger volumes of liquid
FLASK – For mixing and heating liquids; Narrow neck helps prevent splashing
*Glassware & Other Tools Used in the Biology Lab
TEST TUBES
STOPPERS (corks)
TEST TUBE RACK
*Glassware & Other Tools Used in the Biology Lab
EYE DROPPER (PIPETTE) – Used to transfer very small amounts of liquid
TEST TUBE
*Glassware & Other Tools Used in the Biology Lab
------- HOT WATER BATH – A way to safely heat chemicals in test tubes
NOTE: Test tubes should NEVER be stoppered while being heated
------BUNSEN BURNER – Used to heat things over a flame
*Glassware & Other Tools Used in the Biology Lab
CHEMICAL INDICATORS are used to test materials for the presence of various substances such as:
* GLUCOSE (Benedicts)* STARCH (Iodine)* ACID (Blue Litmus Paper)* BASE (Red Litmus Paper)
*Dissecting Tools Used in the Biology Lab
Dissecting Kit
RULER
SCALPEL
FORCEPS
SCISSORS
PIPETTE
PROBES
*Dissecting Pan