Tip 1: How to measure the volume using beakers

volume - a physical quantity that indicates how much space the body in three-dimensional space.Therefore, it is calculated as the product of the three variables: length, width and length of the body - and is measured in cubic units (meters, centimeters, etc.).However, to calculate the volume of a solid body can not know its size.Will the meter beaker.
you need
  • beaker, water, string, a body whose volume is measured.
Guide
1
's look beaker which unit volume indicated on it.In most cases cubic centimeters or milliliters, but may be other values, for example litry.Opredelite dividing unit price by the algorithm.Select two nearby signed numerical values ​​of the stroke, subtract the smaller number from the larger and divide it by the number of points located between these numbers.Example 1 randomly selected two adjacent signed stroke: 20 and 10. The difference between these numbers is: 20 ml - 10 ml = 10 ml.Divisions between the strokes of 10. Hence, the price of division beaker is 1 mL, as 10 ml / 10 ml = 1.
2
Pour into a beaker of water so that it completely fits this solid.Mandatory condition - the body must sink or swim in the water inside it, otherwise it will be defined only by the volume of the body, which disappeared under the water.Knowing the price of division, measure how much water is poured into a beaker (V1).Example 2. Suppose that it is necessary to measure the volume of the nail.The beaker 20 ml of water.V1 = 20 ml.
3
Tie the thread to the body and gently lower it into the water, not throwing, so as not to break the bottom of the vessel.Measure how much water was in the beaker (V2).Find the difference of the initial and final volumes: V2 - V1.The resulting number is the amount of solid tela.Izmeryat volume should be in the same units as the volume of water that is in the units specified on the measuring cylinder.Example 2. After the body lowered into the water, the volume increased to 27 ml.V2 = 27 ml.The volume of the body is equal to 27 ml - 20 ml = 7 ml.

Tip 2: How to measure the capacitance

The most common need for measuring capacitance arises from the owners of vehicles when checking battery availability.There are some simple steps to correctly measure their capacity .
How to measure the capacitance
Guide
1
battery is a galvanic cell in which an electric current is generated by chemical reactions in the battery.
2
Thus, the principle of the battery is not much different from ordinary batteries.Battery capacity - is the amount of electricity that can give a new or fully charged battery.
3
Battery capacity is measured in ampere-hours or milliampere-hours.Thus, if the capacitance battery is 2000ma hour (milliamp-hours), which means that the battery can supply a current 2000 mA for 1 hour or 200 mA for 10 hours.
4
To determine the capacity, the battery must first fully charge, then discharge given current track and time to fully discharge.Then you need to calculate the product of current and time for which the battery is discharged, and the obtained value will capacity th battery.
5
Likewise measured capacity batteries.The point of measurement capacity of the battery or batteries is that you can find the time during which the battery or the battery is fully discharged.After that, the battery will require recharging, and the battery will become completely unusable.
Sources:
  • what is measured battery
Note
When determining unit volume be careful: the designation "ml" or «ml» -is milliliter, "l" or "L" - liters, "refer to the third power" - cubic centimeters.
Helpful Hint
If you want to transfer the amount to other units, are repelled by the rules: 1 milliliter = 1 cubic centimeter;1 liter = 1000 milliliters.
Sources:
  • Physics Grade 7.AVPeryshkin.Moscow."Bustard".2010

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