The BBC Bitesize study guide about temperature changes and energy contains videos, diagrams, graphics and more physics revision notes written to the AQA GCSE physics specification. An interactive ...

Density describes how closely packed the particles are in a solid, liquid or gas. There is little difference between the density of a liquid and its corresponding solid (eg water and ice). This is ...

Our lens reviews offer detailed information on sharpness, distortion, bokeh, and all the other important factors that go into making a lens great. Our reviews give you all the information you need ...

We’ve always been big fans of Sony’s top-flight G Master lenses. They’re big and beautiful, but expensive, designed to suit the best Sony cameras for professionals. These lenses aim for the ultimate ...

Here’s how it works. The best iPhone lenses can quickly boost the quality of your smartphone photos and videos. Both the new iPhone 16 Pro models feature 5x telephoto lenses, while older iPhone ...

I tend to find that the best lenses for landscape photography are wide-angle zooms. Zoom versatility is great for fine-tuning your composition without forcing you to try and get to inaccessible ...

Feb. 14, 2025 — The process of separating useful molecules from mixtures of other substances accounts for 15% of the nation's energy, emits 100 million tons of carbon dioxide and costs $4 ...

If you have frames you love but lenses that are scratched or an old prescription, online services can help with shipping kits or pre-paid labels that allow you to mail in your glasses, get the ...

These well-regarded universities have shown strength in producing research in a wide range of topics related to physics – the study of matter and energy. Topics include particle and nuclear ...

Our expert, award-winning staff selects the products we cover and rigorously researches and tests our top picks. If you buy through our links, we may get a commission. Nasha is a Managing Editor ...

A growing library of quality lenses backs Nikon's mirrorless Z camera system. We're here to break down what's available and recommend the best optics we've tested. Images, and the devices that ...

These are our highest-rated lenses for a range of shooting conditions. Images, and the devices that capture them, are my focus. I've covered cameras at PCMag for the past 13 years, which has given ...