Defining Displacement, Velocity & Acceleration Scalar quantities Remember scalar quantities only have a magnitude (size) Distance: the total length between two points Speed: the total distance ...
Measurement Techniques Common instruments used in Physics are: Metre rules - to measure distance and length Balances - to measure mass Protractors - to measure angles Stopwatches - to measure time ...
Calculating Uncertainty There is always a degree of uncertainty when measurements are taken; the uncertainty can be thought of as the difference between the actual reading taken (caused by the equi...
近日，“2022软科世界大学学术排名”最新发布，排名展示了全球领先的1000所研究型大学。 中国内地共有163所大学上榜，其中8所位列世界百强，比去年增加1所。清华大学表现最佳，排名全球第26，较去年上升2名；北京大...
Random & Systematic Errors Measurements of quantities are made with the aim of finding the true value of that quantity In reality, it is impossible to obtain the true value of any quantity, the...
What are Scalar & Vector Quantities? A scalar is a quantity which only has a magnitude (size) A vector is a quantity which has both a magnitude and a direction For example, if a person goes on ...
Homogeneity of Physical Equations An important skill is to be able to check the homogeneity of physical equations using the SI base units The units on either side of the equation should be the same...
SI Base Quantities There is a seemingly endless number of units in Physics These can all be reduced to six base units from which every other unit can be derived These seven units are referred to as...
What is a Physical Quantity? Speed and velocity are examples of physical quantities; both can be measured All physical quantities consist of a numerical magnitude and a unit In physics, every lette...
Deuterated Solvents in Proton NMR When samples are analysed through NMR spectroscopy, they must be dissolved in a solvent Tetramethylsilane (TMS) is a commonly used solvent in NMR Despite TMS showi...
Use of Tetramethylsilane (TMS) In NMR spectroscopy, Tetrametylsilane (TMS) is used as a reference compound The organic compound is dissolved in TMS before being introduced to the magnetic field of ...
Interpreting & Explaining Proton (<sup>1</sup>H) NMR Spectra Nuclear Magnetic Resonance (NMR) spectroscopy is used for analysing organic compounds Atoms with odd mass numbers usuall...
