This is an interesting question because it really is about how we use the English language in engineering. Day to day we might say that something (or even somebody) is strong or tough and mean the same thing – right?
In engineering we have to be very careful (and very precise) because “strength” and “toughness” mean very different things 🙂
Toughness – ability of a material to absorb energy (and plastically deform without fracturing)
Strength – ability to withstand an applied load without failure
Materials all behave very differently – there is a whole science dedicated to it!
So I know I haven’t answered you question (but Liz has 🙂 )
Random gold fact – it’s one of the most dense elements! That means that a small amount of it is stupidly heavy… If you fill a normal sized mug (normal tea mugs hold about 250 cubic centimetres of liquid) with gold, it would weigh nearly 5 kg! If you do the same with iron that would weigh 2 kg.
If you want to check the maths, here are the numbers I used: volume of a cup = 250 cm3, density of gold = 19 g/cm3, density of iron = 8 g/cm3.